Ono Island is a member of the Kadavu Group, an outlier to Kadavu Island, to the south of Viti Levu, one of Fiji's two main islands. It is separated from Kadavu Island by the Ono Channel. Located at 18.88° South and 178.50° East, this volcanic island is enclosed by the Great Astrolabe Reef. It covers an area of 30 square kilometers.