List of divided islands

{{Fix|text=Several of the density figures, such as those marked ^(*), don't agree with the other statistics.}}

• Among Finland, Norway, and Sweden:
• Three-Country Cairn, the boundary cairn at the tripoint, is 10 metres from the shore of Lake Goldajärvi/Koltajauri, and hence arguably a tiny artificial island. Around 14 m². The lower limit for artificial islands is a matter of definition, because near Haparanda there are boundary poles of less than 0.1 m².
• Between Canada and the United States:
• A lake island at {{coord|62.649677|N|141|W}}, north of the Yukon–Alaska Highway border crossing
• A lake island at {{coord|62.641158|N|141|W}}, north of the Yukon–Alaska Highway border crossing
• A lake island at {{coord|62.637174|N|141|W}}, just north of the Yukon–Alaska Highway border crossing
• Two islands in a small lake at {{coord|62.538443|N|141|W}}, 8.2 km south of the Yukon–Alaska Highway border crossing
• Several rocky islets in a small lake on the Okanogan County, Washington/British Columbia border at {{coord|49|N|120.177376|W}}
• An island in a small lake on the Okanogan County, Washington/British Columbia border at {{coord|49|N|120.172980|W}}
• An island in a small lake adjacent to the Milk River at {{coord|49|N|110.546975|W}} in Montana/Alberta
• An island in Salt Lake (Alkali Lake) {{coord|49|N|104.311173|W}} in Montana/Saskatchewan
• An islandRetrieved 19 June 2013 [http://binged.it/MU9wCu Bing Maps]Retrieved 19 June 2013 [http://www.nd.gov/gis/apps/HubExplorer/#extent=-11575589.13811,6274647.78559,-11574745.34498,6274991.75222&layers=All_GovtBoundaries:17&layers=All_Hydrography:0,1,2,4,5,6,7&layers=All_Locations:0,1,2,3,4&layers=All_Transportation:12,14,20,11,13,15,17,21,22,23&aerial=ESRI%20Imagery@Full North Dakota Hub Explorer] {{Webarchive|url=https://web.archive.org/web/20130508101711/http://www.nd.gov/gis/apps/HubExplorer/#extent=-11575589.13811,6274647.78559,-11574745.34498,6274991.75222&layers=All_GovtBoundaries:17&layers=All_Hydrography:0,1,2,4,5,6,7&layers=All_Locations:0,1,2,3,4&layers=All_Transportation:12,14,20,11,13,15,17,21,22,23&aerial=ESRI%20Imagery@Full |date=2013-05-08 }} in Brush Lake at {{coord|49|N|103.981638|W}} in North Dakota/Saskatchewan
• Two islandsRetrieved 19 June 2013 [http://binged.it/MU9St5 Bing Maps]Retrieved 19 June 2013 [http://www.nd.gov/gis/apps/HubExplorer/#extent=-11156233.80444,6274508.04915,-11155390.01131,6274852.01577&layers=All_GovtBoundaries:17&layers=All_Hydrography:0,1,2,4,5,6,7&layers=All_Locations:0,1,2,3,4&layers=All_Transportation:12,14,20,11,13,15,17,21,22,23&aerial=ESRI%20Imagery@Full North Dakota Hub Explorer] {{Webarchive|url=https://web.archive.org/web/20130508101711/http://www.nd.gov/gis/apps/HubExplorer/#extent=-11156233.80444,6274508.04915,-11155390.01131,6274852.01577&layers=All_GovtBoundaries:17&layers=All_Hydrography:0,1,2,4,5,6,7&layers=All_Locations:0,1,2,3,4&layers=All_Transportation:12,14,20,11,13,15,17,21,22,23&aerial=ESRI%20Imagery@Full |date=2013-05-08 }} in Boundary Lake at {{coord|49|N|100.217095|W}}, in North Dakota/Manitoba
• An islandRetrieved 19 June 2013 [http://binged.it/MUa8bp Bing Maps]Retrieved 19 June 2013 [http://www.nd.gov/gis/apps/HubExplorer/#extent=-11171768.43611,6274473.7122,-11170934.19761,6274919.79392&layers=All_GovtBoundaries:17&layers=All_Hydrography:0,1,2,4,5,6,7&layers=All_Locations:0,1,2,3,4&layers=All_Transportation:12,14,20,11,13,15,17,21,22,23&aerial=ESRI%20Imagery@Full North Dakota Hub Explorer] {{Webarchive|url=https://web.archive.org/web/20130508101711/http://www.nd.gov/gis/apps/HubExplorer/#extent=-11171768.43611,6274473.7122,-11170934.19761,6274919.79392&layers=All_GovtBoundaries:17&layers=All_Hydrography:0,1,2,4,5,6,7&layers=All_Locations:0,1,2,3,4&layers=All_Transportation:12,14,20,11,13,15,17,21,22,23&aerial=ESRI%20Imagery@Full |date=2013-05-08 }} in Lake Metigoshe at {{coord|49|N|100.353901|W}} in North Dakota/Manitoba
• An isletRetrieved 19 June 2013 [http://binged.it/MUayOU Bing Maps]Retrieved 19 June 2013 [http://www.nd.gov/gis/apps/HubExplorer/#extent=-11165442.22698,6274654.05582,-11165020.33042,6274826.03913&layers=All_GovtBoundaries:17&layers=All_Hydrography:0,1,2,4,5,6,7&layers=All_Locations:0,1,2,3,4&layers=All_Transportation:12,14,20,11,13,15,17,21,22,23&aerial=ESRI%20Imagery@Full North Dakota Hub Explorer] {{Webarchive|url=https://web.archive.org/web/20130508101711/http://www.nd.gov/gis/apps/HubExplorer/#extent=-11165442.22698,6274654.05582,-11165020.33042,6274826.03913&layers=All_GovtBoundaries:17&layers=All_Hydrography:0,1,2,4,5,6,7&layers=All_Locations:0,1,2,3,4&layers=All_Transportation:12,14,20,11,13,15,17,21,22,23&aerial=ESRI%20Imagery@Full |date=2013-05-08 }} east of Ross Lake at {{coord|49|N|100.298939|W}} in North Dakota/Manitoba
• An islandRetrieved 19 June 2013 [http://binged.it/MUcTcG Bing Maps]Retrieved 19 June 2013 [http://www.nd.gov/gis/apps/HubExplorer/#extent=-11133607.9962,6274657.04164,-11133186.09963,6274829.02495&layers=All_GovtBoundaries:17&layers=All_Hydrography:0,1,2,4,5,6,7&layers=All_Locations:0,1,2,3,4&layers=All_Transportation:12,14,20,11,13,15,17,21,22,23&aerial=ESRI%20Imagery@Full North Dakota Hub Explorer] {{Webarchive|url=https://web.archive.org/web/20130508101711/http://www.nd.gov/gis/apps/HubExplorer/#extent=-11133607.9962,6274657.04164,-11133186.09963,6274829.02495&layers=All_GovtBoundaries:17&layers=All_Hydrography:0,1,2,4,5,6,7&layers=All_Locations:0,1,2,3,4&layers=All_Transportation:12,14,20,11,13,15,17,21,22,23&aerial=ESRI%20Imagery@Full |date=2013-05-08 }} in a small lake on the Rolette County, North Dakota/Manitoba border at {{coord|49|N|100.013149|W}}
• An islandRetrieved 19 June 2013 [http://binged.it/MUdlI1 Bing Maps]Retrieved 19 June 2013 [http://www.nd.gov/gis/apps/HubExplorer/#extent=-11045261.8699,6274669.2835,-11044418.07676,6275013.25013&layers=All_GovtBoundaries:17&layers=All_Hydrography:0,1,2,4,5,6,7&layers=All_Locations:0,1,2,3,4&layers=All_Transportation:12,14,20,11,13,15,17,21,22,23&aerial=ESRI%20Imagery@Full North Dakota Hub Explorer] {{Webarchive|url=https://web.archive.org/web/20130508101711/http://www.nd.gov/gis/apps/HubExplorer/#extent=-11045261.8699,6274669.2835,-11044418.07676,6275013.25013&layers=All_GovtBoundaries:17&layers=All_Hydrography:0,1,2,4,5,6,7&layers=All_Locations:0,1,2,3,4&layers=All_Transportation:12,14,20,11,13,15,17,21,22,23&aerial=ESRI%20Imagery@Full |date=2013-05-08 }} in a small lake on the Towner County, North Dakota/Manitoba border at {{coord|49|N|99.218163|W}}
• An islandRetrieved 19 June 2013 [http://binged.it/MUdtr4 Bing Maps]Retrieved 19 June 2013 [http://www.nd.gov/gis/apps/HubExplorer/#extent=-10970000.33692,6274661.15403,-10969156.54378,6275005.12066&layers=All_GovtBoundaries:17&layers=All_Hydrography:0,1,2,4,5,6,7&layers=All_Locations:0,1,2,3,4&layers=All_Transportation:12,14,20,11,13,15,17,21,22,23&aerial=ESRI%20Imagery@Full North Dakota Hub Explorer] {{Webarchive|url=https://web.archive.org/web/20130508101711/http://www.nd.gov/gis/apps/HubExplorer/#extent=-10970000.33692,6274661.15403,-10969156.54378,6275005.12066&layers=All_GovtBoundaries:17&layers=All_Hydrography:0,1,2,4,5,6,7&layers=All_Locations:0,1,2,3,4&layers=All_Transportation:12,14,20,11,13,15,17,21,22,23&aerial=ESRI%20Imagery@Full |date=2013-05-08 }} in a small lake on the Cavalier County, North Dakota/Manitoba border at {{coord|49|N|98.541357|W}}
• Pine and Curry Island{{cite web|url=https://www.dnr.state.mn.us/snas/detail.html?id=sna01007|access-date=2021-04-27|title=Pine and Curry Island SNA|website=Minnesota Department of Natural Resources}} in Lake of the Woods on the Minnesota/Ontario border at {{coord|48.876967|N|94.683964|W|type:isle}}
• Seaway Island in Lake St. Clair on the Michigan/Ontario border at {{coord|42.523639|N|82.677582|W|type:isle}}
• An island in a small lake on the border of Maine/New Brunswick at {{coord|46.004988|N|67.7810|W}}, southeast of Hodgdon, Maine
• Province Island in Lake Memphremagog, between Quebec (91%) and Vermont (9%){{cite web| url =http://magogquebec.homestead.com/files/province_island.html | title = Province Island | author = Jacques Boisvert | access-date = 2006-11-04 | quote = It is the largest island in Lake Memphremagog, being 77 acres, of which 7 acres, are in the United States.}}
• Between Norway and Russia:
• In Klistervatn: Store Grenenholmen

{{cite web |url=http://www.grensekom.no/grensekart%20167-177.php |title=Norway-Russia Boundary Map: Boundary markers 167–177: Sandneset-Klistervatn |language=Norwegian, Russian |access-date=2007-09-25 |publisher=Norwegian Boundary Commission for the Norway-Russia border |url-status=dead |archive-url=https://web.archive.org/web/20070814013317/http://www.grensekom.no/grensekart%20167-177.php |archive-date=2007-08-14 }} — boundary markers #169–172

• In Grensevatn: Korkeasaari and an unnamed islet

{{cite web |url=http://www.grensekom.no/grensekart%207-14.php |title=Norway-Russia Boundary Map: Boundary markers 7–14: Grenseberg-Ødevasselva |language=Norwegian, Russian |access-date=2007-09-25 |publisher=Norwegian Boundary Commission for the Norway-Russia border |url-status=dead |archive-url=https://web.archive.org/web/20070814012629/http://www.grensekom.no/grensekart%207-14.php |archive-date=2007-08-14 }} — boundary markers #12–13 (Korkeasaari) & #14 (unnamed islet)

• Between Finland and Russia:
• Äikkäänniemi in Nuijamaanjärvi[http://kansalaisen.karttapaikka.fi/linkki?text=%C3%84ikk%C3%A4%C3%A4nniemi+&scale=16000&y=6761563&x=4421353&lang=en-GB Portion of Nuijamaanjärvi with Äikkäänniemi marked] from Citizen's Mapsite of Finland.
• Suursaari and a smaller island in Ylä-Tyrjä[http://kansalaisen.karttapaikka.fi/linkki?text=Divided+island&scale=16000&y=6835484&x=4489222&lang=en-GB Portion of Yla-Tirja with divided islands at markers 93 (Suursaari) and 94 (smaller island)] from Citizen's Mapsite of Finland.
• Tarraassiinsaari, Härkäsaari, and Kiteensaari in Melaselänjärvi[http://kansalaisen.karttapaikka.fi/linkki?text=H%C3%A4rk%C3%A4saari&scale=16000&y=6929156&x=4560278&lang=en-GB Portion of Melaselänjärvi showing Tarraassiinsaari and Härkäsaari] from Citizen's Mapsite of Finland.[http://kansalaisen.karttapaikka.fi/linkki?text=Kiteensaari&scale=16000&y=6931328&x=4560650&lang=en-GB Portion of Melaselänjärvi showing Kiteensaari] from Citizen's Mapsite of Finland.
• Island in Virmajärvi
• {{ill|Rajasaari|fi}} in Kokkojärvi[http://kansalaisen.karttapaikka.fi/linkki?text=Rajasaari&scale=16000&y=7033916&x=4539523&lang=en-GB Portion of Kokkojärvi showing Rajasaari] from Citizen's Mapsite of Finland.
• Kalmasaari in Vuokkijärvi[http://kansalaisen.karttapaikka.fi/linkki?text=Kalmasaari&scale=16000&y=7172329&x=4506712&lang=en-GB Portion of Vuokkijärvi showing Kalmasaari] from Citizen's Mapsite of Finland.
• Varposaari in Hietajärvi[http://kansalaisen.karttapaikka.fi/linkki?text=Varposaari&scale=16000&y=7173201&x=4506184&lang=en-GB Portion of Hietajärvi showing Varposaari] from Citizen's Mapsite of Finland.
• Parvajärvensaari in Parvajärvi[http://kansalaisen.karttapaikka.fi/linkki?text=Parvaj%C3%A4rvensaari&scale=16000&y=7288902&x=4500529&lang=en-GB Portion of Parvajärvi showing Parvajärvensaari] from Citizen's Mapsite of Finland.
• Keuhkosaari in Pukarijärvi / Ozero Pyukharin{{cite book |title= International Boundary Study No. 74: Finland–U.S.S.R. boundary |publisher= United States Department of State |author= Office of the Geographer, Bureau of Intelligence and Research |date= 1967-02-01 |quote= Hence the frontier runs...to a point on a small unnamed island in Lake Pukarinjarvi between the cape west of the village of Laitela and the Niittysaaryi island. |url= http://www.law.fsu.edu/library/collection/LimitsinSeas/IBS074.pdf |page= 21 |url-status= dead |archive-url= https://web.archive.org/web/20060916035147/http://www.law.fsu.edu/library/collection/LimitsinSeas/IBS074.pdf |archive-date= 2006-09-16 }}[http://kansalaisen.karttapaikka.fi/linkki?text=Keuhkosaari&scale=16000&y=7319252&x=4501271&lang=en-GB Portion of Pukarijärvi with Keuhkosaari marked] from Citizen's Mapsite of Finland.
• Siiheojansuusaari and Tossensaari in Onkamojärvi / Ozero OnkamoInternational Boundary Study No. 74, page 22. ""The frontier follows the creek down to Lake Onkamojarvi, intersects the small island of Siiheojansuusaai and proceeds in a straight line to the small island of Tossensaari."[http://kansalaisen.karttapaikka.fi/linkki?text=Siiheojansuusaari-Tossonsaari+line&scale=16000&y=7411169&x=4461276&lang=en-GB Portion of Onkamojärvi] from Citizen's Mapsite of Finland (Siiheojansuusaari is IV/179; Tossonsaari is IV/180)
• Between Finland and Norway:
• Island in Kivisarijärvi/Keđgisualuijävri[http://kansalaisen.karttapaikka.fi/linkki?text=divided+island&scale=16000&y=7740042&x=4456945&lang=en-GB Portion of Kivisarijärvi with divided island marked] from Citizen's Mapsite of Finland. {{coord|69.735926|N|28.88235|E|type:isle}}
• Island in lake SE of boundary marker 347A[http://kansalaisen.karttapaikka.fi/linkki?text=divided+island&scale=16000&y=7757408&x=3550112&lang=en-GB Neighborhood of boundary marker 347A, with divided island marked] from Citizen's Mapsite of Finland. {{coord|69.89|N|28.3|E|scale:5000}}
• Between Sweden and Norway:Verified at [https://norgeskart.no/ Norwegian state cartographic agency website] {{in lang|en|no|se}}
• Island in Sör Vammsjön/Vammen Søndre (≈2000 m²){{coord | 58.88843 | 11.45739 |type:isle}}
• Hisön/Hisøya in Norra Kornsjön/Nordre Kornsjø (≈0,09 km²)Hisøya: {{coord|58|54|22.8|N|11|39|7.1|E|type:isle}}
• Kulleholmen/Kalholmen (≈5500 m²) and Tagholm/Tåkeholmen (≈600 m²) in Södra Boksjön/Søndre BoksjøSøndre Boksjø: {{coord|59.03|N|11.7|E|type:isle}}
• Salholmen (≈4000 m²), Mosvikøya (≈0.17 km²) and Trollön/Trolløya (≈0.18 km²) in Stora Le/Store LeSalholmen: {{coord|59|14|15.96|N|11|49|32.24|E|type:isle}}; Mosvikøya {{coord|59|15|55|N|11|49|32|E|type:isle}}; Trollön : {{coord|59|15|17.76406|N|11|49|13.45279|E|type:isle}}
• Tannsjöröset (≈50 m²) in Tannsjøen/TannsjönTannsjøen Island ("Nr 54" on Norwegian map): {{coord|59|52|21.67|N|11|54|59.31|E|type:isle}}
• Linneholmene (≈2000 m²) in Helgesjøen/HelgesjönLinneholmene: {{coord|59|53|20.98|N|12|1|59.96|E|type:isle}}
• Jensøya in Holmsjøen (≈0,04 km²)Jensøya: {{coord|59|53|35.77|N|12|6|47.88|E|type:isle}}
• Storøya in Utgardsjøen (≈0,04 km²)Storøya: {{coord|60|0|55.9|N|12|23|42.5|E|type:isle}}
• Fallsjøholmen in Fallsjøen (Nordre Røgden) (≈4000 m²)Fallsjøholmen: {{coord|60|33|2.9|N|12|34|54.76|E|type:isle}}
• Island in KroksjøenKroksjøen's island: {{coord|60.733895|N|12.395381|E|type:isle}}
• Island in Vonsjøen (≈9000 m²)Vonsjøen's island: {{coord|62.260625|N|12.296161|E|type:isle}}
• Island in Skurdalssjøen/KruehkiejaevrieSkurdalssjøen's island: {{coord|63.357646|N|12.085973|E|type:isle}}
• Island in a lake at altitude 710m on the Gihcijoka/Gihtsejåhkå riverGihcijoka island: {{coord|67.665396|N|16.569616|E|type:isle}}
• Three islands in ČoarvejávriČoarvejávri's islands: largest:{{coord|68.029364|N|17.963228|E|type:isle}}; middle:{{coord|68.0262611|N|17.9620527|E|type:isle}}; southern:{{coord|68.0247914|N|17.9604023|E|type:isle}}
• Between Belarus and Latvia:
• Unnamed island in Lake Rychy
• Between Lithuania and Belarus:
• Sosnovec and another nameless island in Lake Drūkšiai{{cite web |url=http://geosite.jankrogh.com/lake_druksiai.htm |title=Lake Druksiai |last=Krogh |first=Jan S. |access-date=2006-12-10}} The international border is marked on the map.{{cite web |url=http://www.ilec.or.jp/database/eur/eur-48.html |title=World Lakes Database: LAKE DRUKSIAI |publisher=International lakes environment committee |access-date=2006-12-10 |quote=Number of main islands (name and area): Zamok (0.26 km²), Sosnovec (0.048 km²), Utovec (0.0088 km²) and 5 nameless islands. |url-status=dead |archive-url=https://web.archive.org/web/20070312203425/http://www.ilec.or.jp/database/eur/eur-48.html |archive-date=2007-03-12 }}{{cite web|url=http://www.ilec.or.jp/database/eur/eur48-01.gif |format=GIF |title=Bathymetric map of Lake Drūkšiai |publisher=International lakes environment committee |access-date=2006-12-10 |url-status=dead |archive-url=https://web.archive.org/web/20060108140521/http://www.ilec.or.jp/database/eur/eur48-01.gif |archive-date=8 January 2006}} Sosnovec is named on this map.Coordinates of Lake Drūkšiai:{{coord|55|37|N|26|38|E|type:waterbody_scale:25000}}
• Between the United Kingdom and Ireland:
• Pollatawny in Lough Vearty.Verified against Ordnance Survey of Ireland 6-inch map of the townland of Tober, County Donegal; surveyed 1905-05-05. Coordinates: {{coord|54.5441|N|8.0084|W|type:waterbody_scale:10000}} Irish national grid reference system: [http://getamap.ordnancesurvey.co.uk/getamap/frames.htm?mapAction=gaz&gazName=g&gazString=G996663 G996663] {{Webarchive|url=https://web.archive.org/web/20131109115852/http://getamap.ordnancesurvey.co.uk/getamap/frames.htm?mapAction=gaz&gazName=g&gazString=G996663 |date=2013-11-09 }}
• Between Argentina and Chile:
• Isla Dos Hitos in Lago General Carrera/Lago Buenos Aires{{cite web|url=https://www.geamap.com/es/chile?fbclid=IwAR0o3t0Pt7ZDrsjpIXNt-7PXbQ9Jra_qA9TYK1xEKmG3FCFEe8GWFEeocFE#zoom=13&lat=-46.3575&lon=-71.7397&layer=29&overlays=FFFFFFFFFFFFFFFFFFFFFFFFFFFFF|title=Visor cartográfico de Chile|access-date=2020-07-07}}
• Between Ethiopia and Djibouti:
• Island off Cape Aleilou in Lake Abbe{{cite book |title= International Boundary Study No. No. 154 – Djibouti – Ethiopia Boundary |publisher= United States Department of State |author= Office of the Geographer, Bureau of Intelligence and Research |date= 1976-02-20 |quote= From Monument No. 53 on the south bank of Lake Abbe, the border crosses the lake from south to north continuing in a straight line for 30 kilometers. It cuts across the islet of hill 255 off Cape Aleilou. |url= http://www.law.fsu.edu/library/collection/LimitsinSeas/IBS154.pdf |page= 8 |url-status= dead |archive-url= https://web.archive.org/web/20131109115403/http://www.law.fsu.edu/library/collection/LimitsinSeas/IBS154.pdf |archive-date= 2013-11-09 }}
• The border between Austria and Hungary cuts across the Neusiedler See/Fertő tó, where the water level fluctuates, sometimes exposing island flats which straddle the border.

• Island ({{ill|Staustufe Apach|de}}) in the Moselle River near Schengen: mostly in France, the tip is in the Moselle condominium shared by Luxembourg and Germany{{cite web|url=http://www.schengen.lu/fileadmin/Remerschen/files/Commune.pdf|title=Map of Commune of Schengen|access-date=2006-12-10|publisher=Commune of Schengen|archive-url=https://web.archive.org/web/20070615000222/http://www.schengen.lu/fileadmin/Remerschen/files/Commune.pdf|archive-date=2007-06-15|url-status=dead}}. Coordinates: {{coord|49.46894|N|6.36812|E|type:isle_scale:10000}}
• Bolshoy Ussuriyskiy (Heixiazi) at the confluence of the Ussuri and Amur rivers, between China and Russia.[http://bestpravo.ru/fed2004/data03/tex14451.htm Дополнительное соглашение между Российской Федерацией и Китайской Народной Республикой о российско-китайской государственной границе на ее Восточной части] {{webarchive|url=https://web.archive.org/web/20110812092950/http://bestpravo.ru/fed2004/data03/tex14451.htm |date=2011-08-12 }} от 14 октября 2004 года.
• Bolshoy (Abagaitu) at the Argun River, between China and Russia.
• An island in the Šešupė River divided between Lithuania and the Kaliningrad Oblast of Russia {{cn|date=August 2017}}
• Corocoro Island in the delta of the Barima River: split between Venezuela and GuyanaThe northern shore of Corocoro is on the open ocean, but it is not truly a sea island as the southern boundary is a freshwater channel. The island is claimed in its entirety by Venezuela. {{coord|8.517|N|60.083|W|}}
• San Jose Island, Río Negro: between Colombia and Brazil.{{cite book|title=International Boundary Study No. 174: Brazil – Colombia boundary|publisher=United States Department of State|author=Office of the Geographer, Bureau of Intelligence and Research|date=1985-04-15|quote=The final report allocated all river islands on the basis of the thalweg with the exception of San Jose Island on the Rio Negro which was split between Brazil (southern half) and Colombia.|url=http://www.law.fsu.edu/library/collection/LimitsinSeas/IBS174.pdf|page=8|url-status=dead|archive-url=https://web.archive.org/web/20060916034142/http://www.law.fsu.edu/library/collection/LimitsinSeas/IBS174.pdf|archive-date=2006-09-16}} Co-ordinates:{{coord|1.228401|N|66.854811|W|type:isle}}
• File:Isla Timoteo Dominguez-Martin Garcia.png is the only land border between Argentina and Uruguay.]]The island complex Martín García–Timoteo Domínguez in the Río de la Plata between Argentina and Uruguay.[http://www.start.org/Projects/AIACC_Project/monitoring/New_Prop_Docs/LA26.pdf Barros, Vicente (Coordinator) Impact Of Global Change On The Coastal Areas Of The Rio De La Plata: Sea Level Rise And Meteorological Effects. Page 7]
• The lower reaches of the Ganges,See [http://en.banglapedia.org/index.php?title=File:NawabganjDistrict.jpg map of] Nawabganj District, [http://en.banglapedia.org/index.php?title=File:RajshahiDistrict.jpg map of] Rajshahi District, and [http://en.banglapedia.org/index.php?title=File:DaulatpurUpazilaKushtia.jpg map of Daulatpur upazila] of Kushtia District, all in Bangladesh. Teesta,See [http://en.banglapedia.org/index.php?title=File:DimlaUpazila.jpg map of Dilma upazila] in Nilphamari District, Bangladesh. and BrahmaputraSee [http://en.banglapedia.org/index.php?title=File:KurigramDistrict.jpg map of] Kurigram district, Bangladesh. Rivers, approaching the Ganges Delta, are braided and contain numerous sand islands called chars.{{cite book|last1=Chowdhury|first1=Sifatul Quader|last2=Chowdhury|first2=Masud Hasan|year=2012|chapter=Char|chapter-url=http://en.banglapedia.org/index.php?title=Char|editor1-last=Islam|editor1-first=Sirajul|editor1-link=Sirajul Islam|editor2-last=Jamal|editor2-first=Ahmed A.|title=Banglapedia: National Encyclopedia of Bangladesh|edition=Second|publisher=Asiatic Society of Bangladesh}} These can be large and inhabited but are impermanent. At any given time, several are likely to straddle the border between India (Assam and West Bengal) and Bangladesh, though this border is not fully specified.
• An island labelled 'Q' in the Maritsa River, between Greece and Turkey.{{cite book|url=http://www.law.fsu.edu/library/collection/LimitsinSeas/IBS041.pdf|title=International Boundary Study No. 41: Greece – Turkey boundary|date=1964-11-23|publisher=United States Department of State|page=7|quote=Returning to the median of the Maritsa, [...] the boundary continues [...] to boundary marker No. 24 on the northern end of an island designated "Q". Thence, the boundary line extends a distance of 800.5 feet to marker No. 25 near the center, thence a distance of 1,804 feet to marker No. 26 on the southwestern extremity of island "Q".|archive-url=https://web.archive.org/web/20090316065314/http://www.law.fsu.edu/library/collection/LimitsinSeas/IBS041.pdf|archive-date=2009-03-16|url-status=dead|author=Office of the Geographer, Bureau of Intelligence and Research}}
• An islet in the Uutuanjoki, between Finland and Norway, at {{coord|69.579665|N|29.231701|E|type:isle}}.
• An islet in the Vadet near Tunnsjø, between Norway and Sweden, at {{coord|64.644443|N|13.71056|E|type:isle}}.
• An islet on the western side of the golf course that straddles the municipalities of Tornio in Finland, and Haparanda in Sweden, at {{coord|65.861513|N|24.129624|E|type:isle}}.
• An islet{{vague|date=June 2013}} in the Euphrates River on the border of Iraq and Syria.{{citation needed|date=June 2013}}
• Nokiel and another unnamed islet in the Dunajec river, between Slovakia and Poland, at {{coord|49.3984|N|20.359726|E|type:isle}}.{{cite journal|url=http://prawo.legeo.pl/prawo/umowa-miedzy-rzeczapospolita-polska-a-republika-slowacka-o-zmianach-przebiegu-granicy-panstwowej-i-zatwierdzeniu-dokumentacji-granicznej-sporzadzona-w-starej-lubowni-dnia-29-lipca-2002-r/zal1|language=Slovak|title=Zmluva medzi Poľskou republikou a Slovenskou republikou o zmenách priebehu štátnej hranice a schválení hraničnej dokumentácie (AGREEMENT between the Polish Republic and the Slovak Republic on changes of the boundary line and the approval of border documentation, drawn up in the Old Ľubovňa on 29 July 2002.)|journal=Dziennik Ustaw|publisher=Prime Minister of Poland|year=2005|issue=203|page=1686|access-date=28 May 2013|archive-url=https://web.archive.org/web/20131109120019/http://prawo.legeo.pl/prawo/umowa-miedzy-rzeczapospolita-polska-a-republika-slowacka-o-zmianach-przebiegu-granicy-panstwowej-i-zatwierdzeniu-dokumentacji-granicznej-sporzadzona-w-starej-lubowni-dnia-29-lipca-2002-r/zal1/|archive-date=2013-11-09|url-status=dead}}
• Nicaragua and Honduras share four islands along a straight-line border in the delta of the Río Negro at the Gulf of Fonseca.
• Argentina and Chile share an island formed by branches of the Río Mayer.{{cite web|url=https://www.geamap.com/es/chile?fbclid=IwAR0o3t0Pt7ZDrsjpIXNt-7PXbQ9Jra_qA9TYK1xEKmG3FCFEe8GWFEeocFE#zoom=14&lat=-48.21633&lon=-72.31631&layer=29&overlays=FFFFFFFFFFFFFFFFFFFFFFFFFFFFF|title=Visor cartográfico de Chile|access-date=2020-07-07}}
• Bolivia and Chile share an island formed by the {{ill|Putani River|es|Río Putani}} and its branch, Quebrado Coipacoipani.{{cite web|url= https://www.geamap.com/es/chile?fbclid=IwAR0o3t0Pt7ZDrsjpIXNt-7PXbQ9Jra_qA9TYK1xEKmG3FCFEe8GWFEeocFE#zoom=15&lat=-17.60263&lon=-69.46613&layer=29&overlays=FFFFFFFFFFFFFFFFFFFFFFFFFFFFF|title=Visor cartográfico de Chile|access-date=2020-07-07}}
• Canada/United States:
• 9 islands serially located in the Clarence River on the Alaska North Slope near Demarcation Bay; northernmost at {{coord| 69.616789|N|141|W}}, southernmost at {{coord|69.557094|N|141|W}}
• One or more islands in Trail Creek at {{coord|68.881754|N|141|W}}, northeast of Arctic Village, Alaska
• An island in Mancha Creek at {{coord|68.663957|N|141|W}}, northeast of Arctic Village, Alaska
• 6 (or more) islands in bifurcated flow in the Firth River at {{coord|68.641781|N|141|W}}, northeast of Arctic Village, Alaska
• An island in Sunaghun Creek at {{coord|67.426117|N|141|W}}, near its mouth at the Porcupine River, downstream of Old Crow, Yukon
• An island in the watershed of the Bluefish River at {{coord|66.838155|N|141|W}}, east of Chalkyitsik, Alaska and 15 km WWSW of [https://www.lakepedia.com/lake/bluefish.html Bluefish Lake, Yukon]
• An island in Fort Creek at {{coord|66.759004|N|141|W}}, east of Chalkyitsik, Alaska
• An island in the Black River (Salmon Fork) at {{coord|66.543661|N|141|W}}, east of Chalkyitsik, Alaska
• An island in Beaver Creek at {{coord|62.227460|N|141|W}}, southwest of Beaver Creek, Yukon
• Two islands in Klehini River at {{coord|59.448142|N|136.365213|W}}, near Klukwan, Alaska
• 11 (or more) islands in bifurcated river flow on Whiting River at {{coord|58.184862|N|133.221034|W}}, upstream of Gilbert Bay, which empties into Stephens Passage
• Two islands in Stikine River at {{coord|56.658546|N|131.848698|W}}, downstream of Great Glacier, Yukon
• An island in Columbia River at Waneta border crossing at {{coord|49.000766|N|117.6335648|W}} in Washington/British Columbia
• An island in Belly River at {{coord|49|N|113.683294|W}} in Montana/Alberta
• An island in a branch of Lee Creek at {{coord|49|N|113.600862|W}} in Montana/Alberta
• An islet in Boundary Creek at {{coord|49|N|113.357300|W}} in Montana/Alberta
• An island in St. Mary River {{coord|49|N|113.326222|W}} in Montana/Alberta
• An islet in Milk River at {{coord|48.998739|N|112.555541|W}} in Montana/Alberta
• An island in Mundell Creek at {{coord|49|N|109.089222|W}} in Montana/Saskatchewan
• An island in McEachern Creek at {{coord|49|N|106.938504|W}} in Montana/Saskatchewan
• An island{{cite web|url=http://www.nd.gov/gis/apps/HubExplorer/#extent=-10932619.34568,6274668.15191,-10931785.10718,6275121.3996&layers=All_GovtBoundaries:17&layers=All_Hydrography:0,1,2,4,5,6,7&layers=All_Locations:0,1,2,3,4&layers=All_Transportation:12,14,20,11,13,15,17,21,22,23&aerial=ESRI%20Imagery@Full|title=NDGIS North Dakota Hub Explorer|access-date=19 June 2013|archive-url=https://web.archive.org/web/20130508101711/http://www.nd.gov/gis/apps/HubExplorer/#extent=-10932619.34568,6274668.15191,-10931785.10718,6275121.3996&layers=All_GovtBoundaries:17&layers=All_Hydrography:0,1,2,4,5,6,7&layers=All_Locations:0,1,2,3,4&layers=All_Transportation:12,14,20,11,13,15,17,21,22,23&aerial=ESRI%20Imagery@Full|archive-date=8 May 2013|url-status=dead}} in the Pembina River at {{coord|49.000288|N|98.206118|W}} in North Dakota/Manitoba
• An island in tributary of Northwest Branch Saint John River at {{coord|46.687062|N|69.998996|W}} in Maine/Quebec
• Two islands on the Maine/New Brunswick border southeast of Monticello, Maine ({{coord|46.272890|N|67.782|W}} and {{coord|46.272293|N|67.782|W}}) that are formed by the forks of a stream that rises from Gentle Lake in Maine, then flows into the North Branch–Meduxnekeag River.

Other islands have been divided by international borders in the past but they are now unified.

The definite borders of modern nation states do not apply in other forms of societal organisation, where "divided" islands may consequently be less noteworthy. For example, in Ancient Greece, the island of Euboea was divided among several city-states, including Chalcis and Eretria; and before its settlement by Europeans, the Island of Tasmania was divided among nine indigenous tribes.

Islands in wartime may be divided between an invading and defending power, as with Crete in 1645–1669 between the Ottoman Empire and the Republic of Venice.

Examples of formerly divided islands include:

• Boundary Islet – divided between the colonies of Victoria (part of New South Wales until 1851) and Tasmania (known as Van Diemen's Land until 1856); remained separated between two Australian states
• Corsica – was divided between the Republic of Pisa and the Republic of Genoa by a ruling by Pope Innocent II in 1132, and it remained so until the Battle of Meloria of 1284. Subsequently Corsica became part of Genoa, Aragon, Genoa again, the Corsican Republic, France, Anglo-Corsican Kingdom, and finally France again.
• Sardinia – was divided into indigenous giudicati since before the year 900 through the extinction of the Giudicato of Arborea in 1420. Since then, Sardinia has successively been a part of Aragon, the Spanish Empire, Piedmont–Sardinia, the Kingdom of Italy, and the Republic of Italy.
• Saaremaa (1237–1570) and Hiiumaa (1254–1563) – Divided between the Livonian Order and the Bishopric of Ösel-Wiek (the Kingdom of Denmark after 1560). Thereafter these were part of Denmark (Saaremaa only), the Kingdom of Sweden, Imperial Russia, Estonia, the Soviet Union, Nazi Germany (1941–1944), the Soviet Union again, and finally Estonia after the dissolution of the Soviet Union in 1991.
• Piirissaar in Lake Peipus – literally "Border Island" in Estonian, it was first divided in the 13th or 14th century and remained divided between the Bishopric of Dorpat and the later Polish Livonia and Swedish Livonia on one side and the Novgorod Republic and the later Principality of Pskov, Pskov Republic and the Tsardom of Russia on the other side until the annexation of Swedish Livonia into Russia in 1721.
• Saint Croix – Dutch, English and French colonists in different settlements from the early 17th century until 1645. {{cite book|last1=Dookhan|first1=Isaac|url={{GBurl|XxT8qxBjwoUC|pg=PA173}}|title=A History of the Virgin Islands of the United States|publisher=Canoe Press|year=1994|isbn=9789768125057|location=Kingston, Jamaica}}, pp. 40-49
• Tobago – from 1654 through 1659, this island had colonies from both the Duchy of Courland and Semigallia and the Dutch Republic. Both of these colonies failed economically and were abandoned.

{{cite web|title=Dutch and Courlanders in Tobago: A history of the first settlements, 1628–1677 |first=Marco |last=Ramerini |url=http://www.colonialvoyage.com/tobago.html |access-date=2007-10-01 |url-status=dead |archive-url=https://web.archive.org/web/20070928031148/http://www.colonialvoyage.com/tobago.html |archive-date=2007-09-28 }}

Later, Tobago became part of the French Empire, then the Kingdom of Great Britain (1706), the United Kingdom of Great Britain and Ireland, the present United Kingdom, and the independent country of Trinidad and Tobago.

• Ternate – divided between the Spanish Empire allied with Tidore, and the Dutch Republic allied with the Sultan of Ternate from 1607 through 1663. Later, Ternate has successive been owned by the Netherlands, the Empire of Japan (1942–1945), Netherlands again, and the independent country of Indonesia, beginning in 1949.
• Long Island, New York – divided between the Dutch Republic and the Kingdom of England beginning in 1640 (de facto, by the founding of the Southold), or in 1650 (de jure, by the Treaty of Hartford), through to the surrender of New Netherland to the British Army in 1664. Thereafter, Long Island has been owned by Kingdom of England, the Kingdom of Great Britain, and the United States from 1781 through the present. Long Island has been part of the State of New York since 1781, and it is the largest island in the Contiguous United States (48 states).
• Great Britain – Earlier divided into three or more kingdoms, including England, Wales, and Scotland, and sometimes ruled in part by the Roman Empire and the Danish Empire. These parts were reduced to just two before 1707, when the Kingdom of England and the Kingdom of Scotland enacted the Acts of Union of 1707, establishing just one monarchy and one parliament. Since 1707, England, Scotland, and Wales have been part of (successively) the Kingdom of Great Britain, the United Kingdom of Great Britain and Ireland, and the United Kingdom of Great Britain and Northern Ireland, often called the United Kingdom for short.
• Sri Lanka – In the 1000s, the island was ruled in part by the Chola Empire, the Tamil Kingdoms in the North, and the Sinhalese Kingdoms in the south. The island was later divided into three or more kingdoms, including the Jaffna Kingdom, the Vanni Nadu, the Kingdom of Kandy, and the Kingdom of Kotte. After waves of Portuguese, Dutch and British colonization, the island was united as a single entity under the British. The country then known as Ceylon attained independence in 1948, and in 1972, the current Democratic Socialist Republic of Sri Lanka was established.
• Newfoundland Island – Earlier divided between Great Britain and the French Empire until the enactment of the Treaty of Utrecht in 1713. Following this treaty, Newfoundland was part of the British Empire. Then it became the partially independent Dominion of Newfoundland, which next became a Province of Canada in 1949.
• Saint Kitts – Divided between Great Britain and the French Empire in 1628. "The island fell to the French in April 1666, but by the Treaty of Utrecht, April 11, 1713, it was yielded entirely to the British crown."{{cite book|title=Boundaries, possessions, and conflicts in Central and North America and the Caribbean| page=344|year=1941|last=Ireland| first=Gordon|publisher=Octagon Books|location=New York}} Then it became part of the British Empire for about 250 years, and finally part of the independent country of Saint Kitts and Nevis. At various times of war in the Caribbean Sea, either France or Great Britain occupied all of Saint Kitts both before and after 1713.
• Elba – divided from 1548 through 1802. Portoferraio belonged to the Duke of Florence (later the Grand Duchy of Tuscany) from 1548 until this was ceded to France in 1802 under the Treaty of Amiens. Porto Longone belonged to the State of Presidi, a client of first the Spanish Empire and then the Kingdom of Naples, from 1557 until ceded to France in 1801 by the Treaty of Florence. The rest of this island belonged to the Principality of Piombino until conquered by the French Empire, and then in 1802 Napoleon made Elba into the Kingdom of Etruria. This island was successively part of the French Empire, the Principality of Piombino under Elisa Baciocchi, under the sovereignty of Napoleon by the terms of the Treaty of Fontainebleau (1814), part of Tuscany again, part of the Kingdom of Italy, Italian Social Republic (1943–44), and finally a part of the Republic of Italy.{{cite book|last=Wolff|first=Sir Henry Drummond|title=The island empire, or, Scenes of the first exile of the Emperor Napoleon I: together with a narrative of his residence on the island of Elba, taken from local information, the papers of the British resident, and other authentic sources|url=https://archive.org/details/bub_gb_5SJRAAAAYAAJ|access-date=27 August 2011|year=1855|publisher=Bosworth|pages=[https://archive.org/details/bub_gb_5SJRAAAAYAAJ/page/n324 304]–322}}{{cite book|last1=Frey|first1=Linda|last2=Frey|first2=Marsha|title=The treaties of the War of the Spanish Succession: an historical and critical dictionary|url=https://books.google.com/books?id=wrJmCvFY6ocC&pg=PA421|access-date=27 August 2011|year=1995|publisher=Greenwood Publishing Group|isbn=978-0-313-27884-6|pages=421–2}}
• Efate – Divided for several months during 1889 between Franceville and the New Hebrides, then under an Anglo-French joint naval commission.
• Sakhalin Island – Divided between the Russian Empire, then the Soviet Union, and the Empire of Japan along the 50th parallel north by the terms of the Treaty of Portsmouth of 1905 through the final Surrender of the Empire of Japan in 1945. Henceforth, all of Sakhalin became part of the Soviet Union, and then the Russian Federation, de facto. Japan still considers the ownership of Sakhalin to be undetermined, and Sakhalin is shown on many Japanese maps as a "no man's land".
• Killiniq Island – divided between Canada and the Colony of Newfoundland and then the Dominion of Newfoundland beginning with the cession of the Rupert's Land to the Dominion of Canada in 1870 as the North-West Territories and the province of Manitoba through 1949 with the confederation of Newfoundland as a Canadian province.
• Ankoko Island in the Cuyuni River on the border between Venezuela and British Guiana (now Guyana).
• Zhongshan Island in the Pearl River Delta was divided between the People's Republic of China and Portuguese Macau before the handover of Macao to China in 1999.
• Frijoles Island within Gatun Lake in the former Panama Canal Zone was split between the United States and Panama on 1 October 1979, the date that the 1977 Panama Canal Treaty took effect. Much of the former Canal Zone area was transferred to Panama on that day. The Panama Railroad served as the new border in an area where it crosses Gatun Lake via a causeway, with the railroad bisecting Frijoles Island. The entire island transferred to exclusive Panamanian jurisdiction on 31 December 1999.{{cite web| url=http://vm136.lib.berkeley.edu/EART/maps/panama.jpg| title=Land and waters of the Panama Canal Treaty (map)| author=United States. Central Intelligence Agency.| year=1987| location=Washington, D.C.| access-date=2015-07-15| archive-date=2016-03-04| archive-url=https://web.archive.org/web/20160304232258/http://vm136.lib.berkeley.edu/EART/maps/panama.jpg| url-status=dead}}{{cite web|title=Carte IV. Aires de terre et d'eau mises à disposition du fonctionnement et de la défense du canal de Panama par le traité relatif au canal de Panama du 7 septembre 1977 |work=Dirección ejecutiva para los asuntos del tratado (DEPAT)|year=1981|location=Ciudad de Panama|url=http://books.openedition.org/iheid/docannexe/image/2062/img-4.jpg| access-date=2015-07-11}}
• The small middle island of Las Tres Hermanas ("The Three Sisters") off the Pacific coast of Panama City was split between the U.S. Panama Canal Zone and Panama by the Taft Agreement on 12 December 1904. The entire island was placed in the Canal Zone on 11 February 1915. Today the Cinta Costera lies on top of it.
• Popes Folly Island in Passamaquoddy Bay between the United States (Maine) and Canada (New Brunswick) had been divided prior to the 1908 border treaty between the U.S. and Great Britain.{{cite book|title=A treaty between Great Britain and the United States providing for the more complete definition and demarcation of the international boundary between the Dominion of Canada and the United States |pages=1–3|year=1908|hdl = 2027/hvd.32044086241809}}{{cite web|url=http://ims.er.usgs.gov/gda_services/download?item_id=5637963|archive-url=https://web.archive.org/web/20170803135014/https://ims.er.usgs.gov/gda_services/download?item_id=5637963|url-status=dead|archive-date=2017-08-03|title=Eastport Quadrant 15x15 grid map|year=1907|publisher=United States Geological Survey|access-date=2016-02-07}} (download)
• Taiwan, historically known as Formosa and Tywan, was in the 17th century colonised by the Dutch and the Spaniards, along with the indigenous Kingdom of Middag.

A few former islands have disappeared because of changes in water levels:

• Vozrozhdeniya Island in the Aral Sea was split between the Soviet Republics of Uzbekistan and Kazakhstan. This border became an international one in 1991 when the Soviet Union was dissolved. By the year 2002, this island had become a peninsula of the mainland because of the falling water level of the Aral Sea.
• The small Bogomerom Archipelago of islets in Lake Chad was formerly divided between Chad and Nigeria.{{cite web |url=http://www.law.fsu.edu/library/collection/LimitsinSeas/maps/bs90.jpg |title=Chad-Nigeria boundary |publisher=United States Department of State |author=Office of the Geographer |date=June 1969 |access-date=2006-12-06 |format=JPEG |url-status=dead |archive-url=https://web.archive.org/web/20070615000219/http://www.law.fsu.edu/library/collection/LimitsinSeas/maps/bs90.jpg |archive-date=2007-06-15 }} The water level of Lake Chad has historically varied a lot, but this level has fallen so low that these islets are now part of the mainland of Africa.

There are islands that lie across different provinces or states of the same country.

Killiniq Island of Canada, which is divided between Newfoundland and Labrador and Nunavut, whereas Melville Island and Victoria Island are divided between Nunavut and the Northwest Territories. In Australia, the Boundary Islet is divided between Tasmania and Victoria.

Smith Island in Chesapeake Bay and Assateague Island, a barrier island on the Atlantic coast of the United States, are divided between the states of Maryland and Virginia. Ellis Island contains a true exclave of the state of New York, which is largely the area of the original natural island, while all land reclamation extensions from 1890-1935 are in New Jersey. The states also share Shooters Island in Newark Bay. Owing only to accretion of silt, an island has arisen spontaneously in the Mississippi River at the location of the boundary trijunction of Arkansas, Louisiana, and Mississippi, and is thus divided among the three states.

Pag, in Croatia, is divided between Zadar County and Lika-Senj County.

Ishima, in Japan, is divided between Kagawa Prefecture in the South and Okayama Prefecture in the north. Chek Lap Kok in Hong Kong is divided between Islands and Tuen Mun districts, and Lantau is divided between Islands and Tsuen Wan districts.

Chongming Island, while most commonly known as main part of Chongming District of Shanghai, is having a long and narrow part on the northwest of the island which administrated by Nantong, Jiangsu.

{{portal|Islands|Lists}}

• List of enclaves and exclaves – a subcategory of pene-enclaves/exclaves
• Condominium (international law) – land jointly administered by two states, rather than divided between them (e. g., Pheasant Island, administered by France and Spain during alternating periods of six months).
• :Category:Disputed islands and list of territorial disputes – includes many islands claimed by multiple countries, but administered by one.
• Guantanamo Bay Naval Base – leased indefinitely by the United States but with sovereignty retained by Cuba
• Korean Demilitarized Zone – includes several small islands
• Lake island

{{reflist|30em}}

• [http://www.worldislandinfo.com/DIVIDEDV1.htm Islands Divided by International Borders]

Divided islands, list of

Divided islands