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). 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.
There are a number of gold mines on Wetar, which have been poorly managed and constitute an environmental concern.
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