Marine Park is a neighborhood in the New York City borough of Brooklyn. The neighborhood lies between Flatlands and Mill Basin to the east, and Gerritsen Beach, Midwood, and Sheepshead Bay to the south and west. It is mostly squared off in area by Gerritsen Avenue, Flatbush Avenue, Avenue U and Kings Highway. The neighborhood's eponymous park is the largest public park in Brooklyn. Charles Downing Lay won a silver medal in town planning at the 1936 Olympics for the planning of Marine Park.