Kadavu Island belongs to Kadavu Province.
The island is 60 kilometres (37 miles) long, with a width varying from 365 metres (1,198 ft) to 8 kilometres (5 miles). The island is almost sliced in two at the narrow Namalata Isthmus, which separates Namalata Bay on the northern coast from Galoa Harbour on the southern coast. Within Galoa Harbour lie Galoa Island and the tiny islet of Tawadromu. Kadavu is characterized by its rugged and mountainous terrain. The tallest mountain is Nabukelevu, also known as Mount Washington, which stands at 805 metres (2,641 feet) high, on the western end of the island.
Kadavu still has 75% of its original rainforest cover and a rich bird diversity, including four species endemic to the island, the velvet dove, the crimson shining-parrot, the Kadavu honeyeater and the Kadavu fantail, in addition to several endemic subspecies (such as a subspecies of the island thrush). Offshore, stringing around the south, east and then away to the north, is the Great Astrolabe Reef, a large barrier reef that is one of Fiji's premier scuba diving resorts.
A 7,800 hectares (19,000 acres) area covering the interior of the eastern part of the island is the East Kadavu Important Bird Area. It contains populations of the vulnerable Shy Ground-dove, Crimson Shining-parrot and Collared Petrel.
Kadavu is one of the least developed areas of Fiji. There are few roads, and the local economy is largely dependent on subsistence farming, supplemented by exports to Viti Levu. The main commercial crop is yaqona (known as Kava around the Pacific islands). There are no banks on Kadavu. Tourism is becoming popular, however, with snorkeling and diving among the major attractions. The chiefly system in Kadavu gives much greater authority to local chiefs than most other areas in Fiji, where local chiefs are more often subservient to a few "paramount chiefs."