A bay is a body of water that is partially enclosed by land, typically with a wide opening to the sea. Bays can vary in size and depth, and they often provide calm waters that are ideal for anchoring boats and fishing. The surrounding land can include beaches, cliffs, or wetlands, which contribute to the bay's unique ecosystem. Bays are important for both environmental and economic reasons. They serve as habitats for various marine life, including fish and birds, and can be crucial for local economies through tourism and fishing industries. Famous examples of bays include Chesapeake Bay in the United States and San Francisco Bay in California.