The Chesapeake Bay is the Nation's largest estuary and historically has supported one of the most productive fisheries in the world. The 64,000-square-mile watershed of the bay provides vital habitat for migratory birds using the Atlantic Flyway. In addition to supporting aquatic communities and wildlife, the bay's watershed serves the economic and recreational needs of 15 million people. The fertile soils of the watershed support significant agricultural production. The agricultural products and other goods produced in the watershed are shipped through ports on the bay, such as Baltimore, Md., and Norfolk, Va., to the world.