Oahu is known as "The Gathering Place". All the Hawaii Island have interesting second names. Maui is the Valley Isle. Kauai is known as the Garden Isle. Molokai is the Friendly Isle. The Island of Hawaii, Hawaii County or Hawaii Island is known as the "Big Island".
Oahu is the third largest of the Hawaiian Islands; however, it is home to about two-thirds of the population of the U.S. state of Hawaii, and is the home of Honolulu International Airport. The state capital, Honolulu, is on Oʻahu's southeast coast. Including small close-in offshore islands such as Ford Island and the islands in Kaneohe Bay and off the eastern (windward) 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. In the 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: Waiʻanae and Koʻolau, with a broad "valley" or saddle (the central Oʻahu Plain) between them. The highest point is Ka'ala in the Waiʻanae Range, rising to 4,003 feet (1,220 m) above sea level