Long Island is situated in the middle of Boston Harbor, Massachusetts. The island is part of the City of Boston, and of the Boston Harbor Islands National Recreation Area. Prior to October 2014, access to the island was via a road over a 4,175-foot (1,273 m) causeway from the Squantum peninsula of North Quincy to Moon Island, and from there, over a 3,050-foot (930 m) two-lane steel bridge from Moon Island to Long Island. The bridge is officially called the Long Island Viaduct.