That would be an island.
An island is an area of land that is smaller than a continent, and is completely surrounded by water. The world's largest island is Greenland.
An area that is completely surrounded by water is an island. If the landmass is surrounded by water on three sides, but is still connected to a larger landmass, then it is a peninsula.
An island.
an island
An Island
An Island.
An Island.
An Island.
Island?
An island is a habitable area of land surrounded by water. An islet is an inhabitable small area of land surrounded by water. A cay (or key) is a habitable small area of land surrounded by water.
Um... Greenland?
a wonderful island.