Ais a wide-mouthed body of water close to shore.
a. gulf
b. bay
c. sea
d. lake

A bay (B) is a wide-mouthed body of water close to shore. A large bay is also known as a gulf (A). A small bay is known as a cove. A bay or a gulf may be found in both a sea or a lake and is partially surrounded by land. There are also cities that are built on the edge of a bay. They are known as  bayside cities. A good example is Lagos, the capital city of Nigeria; a country on the African continent.

Ibelieve it's the pacific islands 

It is nonrenuable which means that once you have used it, it's gone forever.