Governors Island is a island in
Upper New York Bay, approximately from the southern tip of
Manhattan Island and separated from
Brooklyn by
Buttermilk Channel, approximately . It is legally part of the
borough of
Manhattan in
New York City. The
National Park Service administers a small portion of the north of the island as the
Governors Island National Monument, while the Trust for Governors Island operates the rest as a public park. The national historic landmark district, approximately of the northern half of the island, is open to the public for several months in the summer and early fall, and the circumferential road around the island is also open to the public. The island is accessed by ferries from Brooklyn and Manhattan.