Oahu(redirected from O´ahu)
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an island in the Pacific Ocean, part of the Hawaiian Islands (USA). Area, 1,574 sq km. Population, 630,000 (1970).
Oahu is the most densely populated and economically advanced of the Hawaiian Islands. Its terrain is mountainous, with elevations up to 1,228 m, and formed of lavas, primarily basaltic. The climate is tropical maritime and very humid. The coastal plains and the lower sections of the mountain slopes are planted with pineapple and sugarcane. Oahu is a popular tourist area. Its principal city and port is Honolulu. Pearl Harbor—one of the most important US military bases in the Pacific Ocean—is located on Oahu.