Rose Atoll, sometimes called Rose Island or Motu O Manu ("Bird Island") by people of the Manu'a Islands, is an oceanic atoll within the U.S. territory of American Samoa. An uninhabited wildlife refuge, it is the southernmost point belonging to the United States. The land area is just 0.05 km2 (12 acres) at high tide. The total area of the atoll, including lagoon and reef flat amounts to 6.33 km2 (1,560 acres). Just west of the northernmost point is a channel into the lagoon, about 80 m wide. There are two islets on the northeastern rim of the reef, larger Rose Island in the east (3.5 m high) and the non-vegetated Sand Island in the north (1.5 m high). The Rose Atoll Marine National Monument that lies on the two outstanding islands of the Atoll is managed cooperatively between the U.S. Fish and Wildlife Service and the government of American Samoa.