Kingman Reef is a one-square-kilometer tropical coral reef located in the North Pacific Ocean, roughly half way between Hawaiian Islands and American Samoa at 6°24 N, 162°24 W. It is the northernmost of the Northern Line Islands and an unincorporated territory of the United States administered from Washington, DC by the US Navy. The reef is closed to the public.It was found in 1789 by Captain Edmund Fanning of the ship Betsey. Captain W.E. Kingman described it in 1853. It was formally annexed to the United States on May 10, 1922.Kingman is about 920 nautical miles south of Honolulu.