Kadavu (pronounced [kanˈdaβu]), with an area of 411 square kilometres (159 sq mi), is the fourth largest island in Fiji, and the largest island in the Kadavu Group, a volcanic archipelago consisting of Kadavu, Ono, Galoa and a number of smaller islands in the Great Astrolabe Reef. Its main administrative centre is Vunisea, which has an airport, a high school, a hospital, and a government station, on the Namalata Isthmus where the island is almost cut in two. Suva, Fiji's capital, lies 88 kilometres to the north of Kadavu. The population of the island province was 10,167 at the most recent census in 2007.