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Oahu or Oʻ ahu , known as "The Gathering Place" , is the third largest of the Hawaiian Islands and most populous of the islands in the State of Hawaiʻ i . The state capital Honolulu is located on the southeast coast. Including small close-in offshore islands such as Ford Island and the islands in Kaneohe Bay and off the eastern coast, it has a total land area of 596.7 square miles (1,545.4 km² ), making it the 20th largest island in the United States . It is also the most populous island in the Western Hemisphere that neither contains a national capital nor possesses a road or rail connection to a national capital. In greatest dimension, this volcanic island is 44 miles (71 km) long and 30 miles (48 km) across. The length of the shoreline is 227 miles (365 km). The island is the result of two separate shield volcanoes : Waiʻ anae and Koʻ olau , with a broad "valley" or saddle (the central Oʻ ahu Plain) between them. The highest point is Mt. Ka'ala in the Waiʻ anae Range, rising to 4,003 feet (1,220 m) above sea level.