Robert Moses State Park- Long Island is a 875-acre state park in southern Suffolk County, New York. The park lies on the western end of Fire Island, one of the central barrier islands off the southern coast of Long Island, and is known for its five-mile stretch of beaches on the Atlantic Ocean. The park is accessible from Long Island by the Robert Moses Causeway across Great South Bay. Established as Fire Island State Park in 1908, the park is the oldest state park on Long Island.