|Location||South East Asia|
|Archipelago||Barat Daya Islands|
|Kabupaten||Maluku Barat Daya|
The tropical island of Wetar belongs to the Indonesian province of Maluku and is the largest island of the Barat Daya Islands (literally Southwest Islands). It lies east of the Lesser Sunda Islands, which include nearby Alor and Timor, but it is politically part of the Maluku Islands. To the south, across the Wetar Strait, lies the island of Timor; at its closest it is 50 km away. To the west, across the Ombai Strait, lies the island of Alor. To the southwest is the very small island of Liran, which is also part of Wetar district (kecamatan) and, further southwest, the small East Timorese island of Atauro. To the north is the Banda Sea and to the east lie Romang and Damar Islands, while to the southeast lie the other principal islands of the Barat Daya Islands.
Wetar is one of the 92 officially listed outlying islands of Indonesia.
Wetar is 130 km wide east-to-west, and 45 km north-to-south. It has an area of 3600 km². It is surrounded by coral reefs and deep seas. The highest point on the island is 1412 m.
Wetar is part of a volcanic island arc which includes the other Barat Daya Islands and the Banda Islands, created by the collision of the Indo-Australian Plate and the Eurasian Plate. It is not, however, principally of volcanic origin, being instead mainly oceanic crust that has been lifted by the plate collision. The stratovolcano Gunungapi Wetar forms an isolated island to the north of Wetar.
Along with other nearby islands, it formed part of Wallacea, the area of deep water separated from both the Asian and Australian continental shelves. This region is known for its unusual fauna, and Wetar is no exception. It has 162 species of birds, three of which are endemic, and four of which are endangered. Rainfall is highly seasonal based on the monsoon, and the islands are mostly covered in tropical dry broadleaf forests that are partly deciduous, with many trees losing their leaves in the dry season. It forms part of the Timor and Wetar deciduous forests ecoregion.
There are a number of Malayo-Polynesian languages endemic to Wetar and the nearby islands of Liran and Atauro. Called Wetarese, they are Aputai, Ili'uun, Perai, and Tugun. There is also Talur, a dialect of Galoli of East Timor. These are spoken by small groups of about 1,000 people each. The national language Indonesian and regional Ambonese Malay are commonly used.
- "Gunungapi Wetar". Global Volcanism Program. Smithsonian Institution. Retrieved 2006-12-29.
- A copper mine is under construction in the north of the island. Terrestrial Ecoregions – Timor and Wetar deciduous forests (AA0204). Worldwildlife.org. Retrieved on 2010-12-18.
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