Delaware Bay is the estuary outlet of the Delaware River on the northeast seaboard of the United States, lying between the states of Delaware and New Jersey. Approximately 782 square miles (2,030 km) in area, the bay's freshwater mixes for many miles with the saltwater of the Atlantic Ocean.
The bay is bordered inland by the states of Delaware and New Jersey, and its mouth is framed by Cape Henlopen in Delaware and Cape May in New Jersey, on the Atlantic. Delaware Bay is bordered by six counties: Sussex, Kent, and New Castle in Delaware, and Cape May, Cumberland, and Salem in New Jersey. The Cape May–Lewes Ferry crosses Delaware Bay from North Cape May, New Jersey, to Lewes, Delaware. The bay's ports are managed by the Delaware River and Bay Authority.