Fire Island is a barrier island adjacent to the south shore of Long Island, New York. It is approximately 50 kilometers (31 mi) long and varies between 160 and 400 meters (520 and 1,300 ft) broad. Fire Island is part of Suffolk County. It comprises a number of hamlets, census-designated places (CDPs), and villages, all of which lie within the towns of Islip, Brookhaven and Babylon. Fire Island is approximately 8.9 kilometers (5.5 mi) south of Long Island, but varies widely. It is separated from Long Island by a series of interconnected bays: Great South Bay, Patchogue Bay, Bellport Bay, Narrow Bay, and Moriches Bay. The island is accessible by automobile via Robert Moses Causeway on its western end and by William Floyd Parkway (Suffolk County Road 46) near its eastern end. Motor vehicles are not permitted on the rest of the Island, except for utility, construction and emergency access and with limited beach driving permits in winter. The island and its resort towns are accessible by boat, seaplane and a number of ferries, which depart from both Bay Shore and Sayville.