The Peninsulas ClipArt gallery offers 2 examples of landforms that extend into a body of water and are surrounded on three sides by water.

"Though not an island, Gibraltar is connected with the Spanish mainland only by a flat strip of sandy ground. The rock, which is about 2 1/2 miles in length, rises to a height of 1400 feet. At the base and on the summit are powerful batteries, while the sides are pierces with loopholes and galleries for cannon. There is also an inclosed harbor in which a fleet can safely anchor. Gibraltar has remained in British hands since 1704."—Webster, 1920.

Gibraltar

"Though not an island, Gibraltar is connected with the Spanish mainland only by a flat strip of sandy…

A peninsula with a lighthouse on it.

Peninsula

A peninsula with a lighthouse on it.