Inlet, southern coast of Oahu island, Hawaii, U.S. It lies 6 mi (10 km) west of Honolulu , forming a landlocked harbour connected with the Pacific Ocean.
In 1887 Hawaii granted the U.S. the exclusive use of the harbour as a coaling and repair station, and in 1908 a naval station was established. In 1941 the harbour was attacked without warning by the Japanese air force, causing great loss of life and precipitating U.S. entry into World War II . It is now the headquarters of the U.S. Pacific Fleet.