concavity of a coastline or reentrant of the sea, formed by the movements of either the sea or a lake. The difference between a bay and a gulf is not clearly defined, but the term bay usually refers to a body of water somewhat smaller than a gulf....

Semicircular or nearly circular concavity, similar to a gulf but usually smaller. Bays may range from a few hundred yards to several hundred miles from side to side. They are usually located where easily eroded rocks, such as clays and sandstones, are...

Each bay has its own wind....

A headland is an area of land adjacent to water on three sides. A bay is the reverse, rather an area of water bordered by land on three sides. A large headland may also be called a peninsula. Long, narrow and high headlands may be called promontories....