Peninsula

The word peninsula derives {{etymology|la|{{wikt-lang|la|paeninsula}}|}}, {{etymology||{{wikt-lang|la|paene}}|almost||{{wikt-lang|la|insula}}|island}}. The word entered English in the 16th century.{{Sfn|HMH|2004|p=216}}

A peninsula is generally defined as a piece of land surrounded on most sides by water.{{Cite web |last=Kersey |first=Paul |date=23 July 2021 |title=What is a Peninsula? |url=https://www.infoplease.com/world/geography/what-is-a-peninsula |access-date=2022-04-30 |website=Infoplease |language=en}}{{Cite web |title=list of peninsulas |url=https://www.britannica.com/topic/list-of-peninsulas-2024442 |access-date=2022-04-30 |website=Britannica |language=en}}

A peninsula may be bordered by more than one body of water, and the body of water does not have to be an ocean or a sea.{{Sfn|Heos|2010|p=15}} A piece of land on a very tight river bend or one between two rivers is sometimes said to form a peninsula, for example in the New Barbadoes Neck in New Jersey, United States. A peninsula may be connected to the mainland via an isthmus, for example, in the Isthmus of Corinth which connects to the Peloponnese peninsula.{{Sfn|Heos|2010|p=9}}

Peninsulas can be formed from continental drift, glacial erosion, glacial meltwater, glacial deposition, marine sediment, marine transgressions, volcanoes, divergent boundaries or river sedimentation.{{sfn|Mis|2009|p=6}} More than one factor may play into the formation of a peninsula. For example, in the case of Florida, continental drift, marine sediment, and marine transgressions were all contributing factors to its shape.{{Sfn|Heos|2010|p=8}}

Peninsulas can also be man-made. Typically, they are built as protection from ocean or sea waves by building a Breakwater, which sometimes connects back to land. They can also be built to expand areas of a city; for example, Copenhagen is planning to create a peninsula that houses 35,000 residents by 2070.{{cite web | url=https://www.dr.dk/nyheder/politik/loekke-afsloerer-gigaprojekt-der-skal-bygges-en-ny-oe-i-koebenhavn-med-plads-til | title=Løkke afslører gigaprojekt: Der skal bygges en ny ø i København med plads til 35.000 beboere | date=5 October 2018 | website= dr.dk| publisher= | location= Denmark| access-date= }}

In the case of formation from glaciers (for example, the Antarctic Peninsula or Cape Cod), peninsulas can be created due to glacial erosion, meltwater or deposition.{{Sfn|Heos|2010|p=31}} If erosion formed the peninsula, softer and harder rocks were present, and since the glacier only erodes softer rock, it formed a basin.{{Sfn|Heos|2010|p=31}} This may create peninsulas, and occurred for example in the Keweenaw Peninsula.{{Sfn|Heos|2010|p=31}}

In the case of formation from meltwater, melting glaciers deposit sediment and form moraines, which act as dams for the meltwater.{{Sfn|Heos|2010|p=31}} This may create bodies of water that surround the land, forming peninsulas.{{Sfn|Heos|2010|p=31}}

If deposition formed the peninsula, the peninsula was composed of sedimentary rock, which was created from a large deposit of glacial drift.{{Sfn|Nadeau|2006|p=6}}{{Sfn|Heos|2010|p=32–33}} The hill of drift becomes a peninsula if the hill formed near water but was still connected to the mainland, for example during the formation of Cape Cod about 23,000 years ago.{{Sfn|Nadeau|2006|p=9}}{{Sfn|Wyckoff|1999|p=328}}

In the case of formation from volcanoes, when a volcano erupts magma near water, it may form a peninsula (such as the Alaskan Peninsula).{{Sfn|Nadeau|2006|p=6}} Peninsulas formed from volcanoes are especially common when the volcano erupts near shallow water.{{Sfn|Heos|2010|p=44}} Marine sediment may form peninsulas by the creation of limestone.{{Sfn|Heos|2010|p=21–23}} A rift peninsula may form as a result of a divergent boundary in plate tectonics (such as the Arabian Peninsula),{{Sfn|Nadeau|2006|p=10}}{{Sfn|Heos|2010|pp=43–44}} while a convergent boundary may also form peninsulas (for example, Gibraltar or the Indian subcontinent).{{Sfn|Heos|2010|p=40}} Peninsulas can also form due to sedimentation in rivers. When a river carrying sediment flows into an ocean, the sediment is deposited, forming a delta peninsula.{{Sfn|Nadeau|2006|p=13}}

Marine transgressions (changes in sea level) may form peninsulas, but also may affect existing peninsulas. For example, the water level may change, which causes a peninsula to become an island during high water levels.{{Sfn|Niz|2006|p=7}} Similarly, wet weather causing higher water levels make peninsulas appear smaller, while dry weather make them appear larger.{{Sfn|Niz|2006|p=13}} Sea level rise from global warming will permanently reduce the size of some peninsulas over time.{{Sfn|Nadeau|2006|p=21}}

Peninsulas are noted for their use as shelter for humans and Neanderthals.{{Sfn|Heos|2010|p=45}} The landform is advantageous because it gives hunting access to both land and sea animals.{{Sfn|Heos|2010|p=45}} They can also serve as markers of a nation's borders.{{Sfn|Heos|2010|p=48}} In history, Peninsulas have played vital role in trade and commerce because of their access to water through an isthmus. The Malay Peninsula, located at the convergence of the Indian Ocean and the China Seas, played an important role in east-west trade.{{Cite web |title=Did you know?: Ancient Trading Centres in the Malay Peninsula| publisher= Silk Roads Programme, UNESCO (United Nations Educational, Scientific and Cultural Organization)| website= unesco.org |url= https://en.unesco.org/silkroad/content/did-you-know-ancient-trading-centres-malay-peninsula |access-date=2025-02-13}}

{{Further|List of peninsulas}}

{{Portal|Geography}}

• Barrier island
• Cape
• Headland
• Promontory
• Salient
• Spit
• Tidal island

{{reflist|30em}}

{{refbegin}}

• {{Cite book |last=Heos |first=Bridget |url=https://www.worldcat.org/oclc/277466133 |title=The creation of peninsulas |date=2010 |publisher=Rosen Pub |isbn=978-1-4358-5301-0 |edition=1st |location=New York |oclc=277466133}}
• {{Cite book |last=Mis |first=Melody S. |url=https://www.worldcat.org/oclc/230802567 |title=Exploring peninsulas |date=2009 |publisher=PowerKids Press |isbn=978-1-4358-2711-0 |edition=1st |location=New York |oclc=230802567}}
• {{Cite book |last=Nadeau |first=Isaac |url=https://www.worldcat.org/oclc/57068647 |title=Peninsulas |date=2006 |publisher=Rosen Pub. Group's PowerKids Press |isbn=1-4042-3125-0 |edition=1st |location=New York |oclc=57068647}}
• {{Cite book |last=Niz |first=Ellen Sturm |url=https://www.worldcat.org/oclc/57366483 |title=Peninsulas |date=2006 |publisher=Capstone Press |isbn=0-7368-4308-6 |location=Mankato, Minn. |oclc=57366483}}
• {{Cite book |year=2004 |title=Word Histories and Mysteries: From Abracadabra to Zeus |publisher=Houghton Mifflin Harcourt |isbn=978-0547350271 |oclc=55746553 |page= |last= |url=https://books.google.com/books?id=cZ88p_bSt1EC&pg=PA216 |ref={{harvid|HMH|2004}}}}
• {{Cite book |last=Wyckoff |first=Jerome |url=https://www.worldcat.org/oclc/43274886 |title=Reading the earth : landforms in the making |date=1999 |publisher=Adastra West, Inc |isbn=0-9674075-0-8 |location=Mahwah, NJ |oclc=43274886}}

{{refend}}

• {{wiktionary-inline}}

{{Earth's landforms}}

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Category:Landforms