Kadavu (pronounced ), with an area of , 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.