Barnegat Bay is a small brackish arm of the Atlantic Ocean, approximately 42 miles (67.2 km) long, along the coast of Ocean County, New Jersey in the United States. It is separated from the Atlantic by a long barrier peninsula, as well as by the north end of Long Beach Island. The bay is fed by several small rivers, including the Toms River and Metedeconk River, which empty into the bay through small estuaries along its inner shore.