The island of Ohau is the most populated of the Hawaiian Islands, with about 1 million inhabitants. Its main city, Honolulu, is the capital of the archipelago. The island shelters the famous beach of Waikiki, paradise of the surfers, as well as the naval base of Pearl Harbour, bombed by Japanese in 1941, hastening the end of the 2nd world war. On Oahu is the biggest windmill of the world, with 2 blades of 122 m in length.