A- Peninsula --- Has water on three sides
A peninsula is an extension of land that is surrounded by water everywhere except for an area or isthmus that links it to the continent.
B- Cape --- Small extension of land
A cape is a geographical accident formed by a land mass that projects into the sea.
C- Strait --- Joins two waterways
A strait is a water channel that connects two bodies of water (seas, oceans or lakes), and therefore, is between two land masses.
D- Bay --- Indentation of shore
A bay is a sea, ocean or lake entrance surrounded by land except for an opening, which is usually wider than the rest of the penetration inland.