Coney Island is a residential neighborhood, peninsula and beach on the Atlantic Ocean in southwestern Brooklyn, New York City. The site was formerly an outer barrier island, but became partially connected to the mainland by landfill. 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, and Gravesend to the north. Coney Island is well known as the site of amusement parks and a seaside resort. The attractions reached their peak during the first half of the 20th century, declining in popularity after World War II and years of neglect. In recent years, the area has seen the opening of MCU Park and has become home to the Brooklyn Cyclones minor league baseball team.