A peninsula (from Latin paeninsula; from paene 'almost', and insula 'island')[1][2] is a landform that extends from a mainland and is surrounded by water on most, but not all of its borders.[3][4][5] A peninsula is also sometimes defined as a piece of land bordered by water on three of its sides.[3][6] Peninsulas exist on all continents.[7][2] The size of a peninsula can range from tiny to very large.[7] The largest peninsula in the world is the Arabian Peninsula.[8][9] Peninsulas form due to a variety of causes.

Satellite photos of peninsulas, clockwise from the top left: The Fennoscandian Peninsula, the Floridian Peninsula, the Arabian Peninsula, and the Horn of Africa.

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