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.