Marine Park is the name of a neighborhood and the largest public park in the New York City borough of Brooklyn, that lies between Flatlands and Mill Basin to the east, and Gerritsen Beach, Midwood, and Sheepshead Bay to the south and west. The neighborhood is mostly squared off in area by Gerritsen Avenue, Flatbush Avenue, Avenue U and Kings Highway. The eponymous park is within the neighborhood. The neighborhood is largely made up of ethnic groups such as Italians, Irish, Greeks, and Jews. The area is part of Brooklyn Community Board 18.Charles Downing Lay won a silver medal in town planning at the 1936 Olympics for the planning of Marine Park.
The neighborhood is situated around Gerritsen Creek, the westernmost inlet of Jamaica Bay; the creek's path within the neighborhood was covered in 1920. During the last 5,000 years, strips of sand were deposited by ocean currents. These beach strips form a surf-barrier and allow salt marshes to thrive:
...Gerritsen Creek was a freshwater stream that once extended about twice as far inland as it does today. Around 1920 the creek north of Avenue U was converted into an underground storm drain. Yet it continues to supply the salt marsh with fresh water, which helps the marsh support a wide range of organisms. ...