Marine Park is a public park located on Jamaica Bay in the neighborhood of Marine Park in Brooklyn, New York. Its 798 acres surround the westernmost inlet of the bay. Most of the land for Marine Park was donated to New York City to be turned into public park land by the Whitney family in 1920 and by Frederic B. Pratt and Alfred Tredway White, wh…Marine Park is a public park located on Jamaica Bay in the neighborhood of Marine Park in Brooklyn, New York. Its 798 acres surround the westernmost inlet of the bay. Most of the land for Marine Park was donated to New York City to be turned into public park land by the Whitney family in 1920 and by Frederic B. Pratt and Alfred Tredway White, who jointly donated 150 acres in 1917. The land donated consists of the area between the current day Fillmore Avenue and Gerritsen Avenue and East 38th Street. Originally almost 2,000 acres, over half of which has been donated to the National Park Service as part of the Gateway National Recreation Area, the park is mainly a fertile salt marsh which is supplied with freshwater from Gerritsen Creek.