tidal island
{{Short description|Island accessible by foot at low tide}}
{{Redirect-distinguish|Tide island|Tied island}}
{{for|an island which disappears at high tide|Vanishing island}}
{{More citations needed|date=October 2023}}
Image:England-Saint-Michaels-Mount-1900-1.jpg, Cornwall, at high tide, {{circa|1900|lk=yes}}]]
File:Cramond Island and causeway from air.JPG, Scotland, at high tide: the causeway is submerged, but the anti-boat pylons are still visible]]
A tidal island is a raised area of land within a waterbody, which is connected to the larger mainland by a natural isthmus or man-made causeway that is exposed at low tide and submerged at high tide, causing the land to switch between being a promontory/peninsula and an island depending on tidal conditions.
Because of the mystique surrounding tidal islands, many of them have been sites of religious worship, such as Mont-Saint-Michel with its Benedictine abbey. Tidal islands are also commonly the sites of fortresses because of the natural barrier created by the tidal channel.
List of tidal islands
=Asia=
==Hong Kong==
- Ma Shi Chau in Tai Po District, northeastern New Territories, within the Tolo Harbour
- Kiu Tau Island in Sai Kung
==Iran==
- Naaz islands in the Persian Gulf, southern seashore of Qeshm island
==Japan==
==Taiwan==
- Kueibishan in Penghu
- Jiangong Islet in Kinmen
==South Korea==
- Jindo Island and Modo Island in southwest South Korea
- Jebudo in the west
=Europe=
== Denmark==
- Mandø Island – on Denmark's western coast
- Knudshoved Island – north of Vordingborg on southern Zealand, Denmark
== Denmark/Germany ==
- The Halligen in the North Frisian Islands, Denmark/Germany
==France==
File:Lun de Miel 443 (419901103).jpg in Normandy]]
- Île Aganton in Brittany
- Île Madame in Charente-Maritime
- Île de Noirmoutier in Vendée
- Mont Saint-Michel in Normandy
- Tombelaine in Normandy
- Grand Bé, Petit Bé and Fort National in Saint-Malo
== Germany ==
- The Neuwerk in the Wadden Sea
== Guernsey ==
- Lihou in Guernsey, one of the Channel Islands
==Iceland==
Grótta in Seltjarnarnes, the Capital Region
==Ireland==
== Italy ==
- Isola Grande, Sicily
== Jersey ==
- Elizabeth Castle in Jersey, a castle off the south coast accessible on foot at low tide
- Saint Aubin's Fort
- La Corbière Lighthouse
- La Motte, Jersey, alias Green Island
- L'Avarison, which hosts Seymour Tower
- Archirondel Tower, now connected via permanent causeway
- Icho Tower
- Portelet Tower
==Spain==
- Cortegada Island in Pontevedra coast, Galicia.
- San Nikolas Island in Lekeitio, Bizkaia
==United Kingdom==
File:Rough Island from Tornat Wood - geograph.org.uk - 1305616.jpg opposite Rockcliffe, Dumfries & Galloway, Scotland]]
File:Worm's Head (Rhossili).jpg at the end of Gower, Wales]]
===England===
- Asparagus Island, Mount's Bay, Cornwall
- Burgh Island, Devon
- Burrow Island, Portsmouth Harbour
- Chapel Island, Cumbria
- Chiswick Eyot in the River Thames in London
- Gugh in the Isles of Scilly (joined to St Agnes at low tide)
- Hilbre Island, Middle Eye and Little Eye in the River Dee estuary, between North Wales and the English Wirral, but administratively in England.
- Horsey Island, Essex
- Lindisfarne, Northumberland, also known as Holy Island
- Mersea Island, Essex (accessible to road traffic via the Strood)
- Northey Island, Essex
- Osea Island, Essex
- Piel Island, Cumbria
- Scolt Head Island, Norfolk
- Sheep Island, Cumbria (joined at low tide to Piel Island and to Walney Island)
- St Mary's Island, North Tyneside
- St Michael's Mount, Cornwall
- White Island, Isles of Scilly and St Martin's, Isles of Scilly
===Northern Ireland===
File:Guns_Island_from_Ballyhornan_Bay_at_low_tide.jpg Bay, Northern Ireland at low tide]]
- Nendrum Monastery on Mahee Island, Strangford Lough
- Guns Island, near Ballyhornan
- Isle of Muck, Portmuck
- Rough Island, near Comber, Strangford Lough
Accessible at low-tide, this walk around Rough Island provides magnificent views of Strangford Lough and is an excellent view point for bird watching.
===Scotland===
- Baleshare in the Outer Hebrides, joined to North Uist
- Bernera Island, joined to Lismore
- Brough of Birsay in Orkney, joined to Orkney Mainland
- Castle Stalker on Loch Laich in Argyll
- Cramond Island in the Firth of Forth
- Island Davaar near Campbeltown, off the Kintyre peninsula
- Eilean Arnoil in the Outer Hebrides, joined to the Isle of Lewis
- Eilean Donan in the western Highlands of Scotland
- Eilean Fladday and Eilean Tigh off the Isle of Raasay
- Eilean Shona in Loch Moidart, Lochaber, Highland
- Eilean Tioram, in Loch Moidart
- Erraid off the Isle of Mull
- Hestan Island near Rough Island in Auchencairn Bay
- Islands of Fleet: Ardwall Isle and Barlocco Isle in Galloway
- Isle Ristol, the innermost of the Summer Isles
- Kili Holm in Orkney, joined to Egilsay
- Oronsay in the Inner Hebrides, joined to Colonsay
- Oronsay in Loch Bracadale, joined to Skye
- Orosay in the Outer Hebrides, joined to Barra
- Rough Island opposite Rockcliffe, Dumfries & Galloway
- Vallay (Bhàlaigh), joined to North Uist in the Outer Hebrides
===Wales===
- Burry Holms off the Gower
- Cribinau off Anglesey
- Gateholm off the south west coast of Pembrokeshire
- Ynys Llanddwyn off Anglesey
- Mumbles Lighthouse located in Mumbles, near Swansea
- St Catherine's Island in Pembrokeshire
- Sully Island in the Vale of Glamorgan
- Worm's Head at the end of the Gower
- Ynys Cantwr off Ramsey Island, Pembrokeshire
- Ynys Feurig off Anglesey
- Ynys Gifftan in Gwynedd
- Ynys Gwelltog off Ramsey Island, Pembrokeshire
- Ynys Lochtyn on the coast of Cardigan Bay
43 (unbridged) tidal islands can be walked to from the UK mainland.{{cite book |author=Peter Caton|title=No Boat Required – Exploring Tidal Islands|year=2011|publisher=Troubador Publishing Limited |isbn=978-1848767-010}}
=North America=
==Canada==
- Bird Islet in Neck Point Park, Nanaimo, British Columbia, Canada
- Finisterre Island off of Bowen Island, British Columbia, Canada
- Francis Peninsula off of Sunshine Coast (British Columbia), British Columbia, Canada
- Micou's Island in St. Margarets Bay, Nova Scotia, Canada
- Minister's Island in New Brunswick, Canada
- Ross Island and Cheney Island in Grand Manan, New Brunswick, Canada
- Wedge Island, Nova Scotia, Canada
- Whyte Islet in West Vancouver, British Columbia, Canada
==United States==
File:Bar island 1.JPG in Maine, U.S.]]
- Bar Island in Maine
- Battery Point Light in California
- Bumpkin Island in Massachusetts
- Camano Island in Puget Sound of Washington state, since earth filled
- Charles Island, in Connecticut
- Douglas Island in Alaska
- High Island, New York
- Long Point Island,{{usurped|1=[https://web.archive.org/web/20070927015116/http://www.longpointisland.com/ longpointisland.com]}} Harpswell, Maine
- Tskawahyah Island of Cape Alava, Washington
=Oceania=
==Australia==
- The Point Walter Sandbar in Perth, Western Australia has slowly formed into a tidal island and is only connected to the mainland in extreme low tides.
- Penguin Island (Western Australia) in the Shoalwater Islands Marine Park
- Former tidal island Bennelong Island in Sydney, Australia was developed into Bennelong Point and is now the location of the Sydney Opera House.
==New Zealand==
File:Rangitoto from Achilles Point.jpg forms a backdrop to a wave-cut platform off Achilles Point, Auckland, New Zealand.]]
- Matakana Island in Tauranga Harbour
- Opahekeheke Island in the Kaipara Harbour
- Puddingstone Island in Otago Harbour
- Rabbit Island, Bells Island, and Bests Island in Tasman Bay
- The Hauraki Gulf islands of Motutapu Island and Rangitoto Island are connected at low tide
- The Okatakata Islands in Rangaunu Harbour
See also
{{portal|Islands}}
- {{anl|Islet}}
- {{anl|Peninsula}}
- {{anl|Presque-isle}}
- {{anl|Tied island}}
- {{anl|Vanishing island}}
References
{{reflist}}
External links
- {{Commons category-inline|Tidal islands}}
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{{Coastal geography}}