American Samoa, located within the geographical region of Oceania, is one of only two possessions of the United States in the Southern Hemisphere, the other being Jarvis Island. Its total land area is —slightly larger than Washington, D.C.—consisting of five rugged, volcanic islands and two coral atolls. The five volcanic islands are Tutuila, Aunu'u, Ofu, Olosega, and Ta‘ū. The coral atolls are Swains and Rose Atoll. Of the seven islands, Rose Atoll is the only uninhabited one; it is a Marine National Monument. American Samoa is the southernmost reach of the United States at fourteen degrees below the equator.