peninsula

n. area of land that is surrounded by water on three sides

A peninsula is a piece of land that is bordered on three sides by water. A peninsula can also be a headland, cape, island promontory, bill, point, or spit.
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Noun
1. a large mass of land projecting into a body of water
(hypernym) land, dry land, earth, ground, solid ground, terra firma
(hyponym) Asia Minor, Anatolia

n. peninsula, area of land that is surrounded by water on three sides

(n.)
A portion of land nearly surrounded by water, and connected with a larger body by a neck, or isthmus.