Aerial view of the U.S. Naval Operating Base, Pearl Harbor, Oahu, Hawaii, looking southwest on 30 October 1941.

Ford Island Naval Air Station is in the centre, with the Pearl Harbor Navy Yard just beyond it, across the channel.

The airfield in the upper left centre is the U.S. Army's Hickam Field.

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Pearl Harbor is an American lagoon harbour on the island of Oahu, Hawaii, west of Honolulu. It has been long visited by the Naval fleet of the United States, before it was acquired from the Hawaiian Kingdom by the U.S. with the signing of the Reciprocity Treaty of 1875.

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Much of the harbour and surrounding lands are now a United States Navy deep water naval base. It is also the headquarters of the United States Pacific Fleet. The U.S. government first obtained exclusive use of the inlet and the right to maintain a repair and coaling station for ships here in 1887.

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Following the overthrow of the Hawaiian Kingdom, the United States Navy established a base on the island in 1899. On December 7, 1941, the base was attacked by the Imperial Japanese Navy airplanes and midget submarines, causing the American entry into World War II. There was no meaningful plan for the air defense of Hawaii, for American commanders had no understanding of the capabilities and proper employment of air power. As it was, had the Pacific Fleet acted on the war warnings the fleet would have put to sea where the major ships would have been sunk in deep water, making salvage impossible.

Source: Wikipedia