Barnegat Bay (BAHR-nuh-guht), arm of the Atlantic Ocean, c.30 mi/50 km long, E N.J., entered through Barnegat Inlet bet. Long Beach Isl. and Isl. Beach Peninsula. A floating light 15 mi/24 km off the coast now alerts travelers since the lighthouse retired from service. The Barnegat Lighthouse is now part of a state park.