Coney Island is a peninsular residential neighborhood, beach, and leisure/entertainment destination on the Atlantic Ocean in the southwestern part of the borough of Brooklyn, New York City. The site was formerly an outer barrier island, but became partially connected to the mainland by land fill. The residential portion of the peninsula is a community of 60,000 people in its western part, with Sea Gate to its west, Brighton Beach and Manhattan Beach to its east, the Atlantic Ocean to the south, and Gravesend to the north.