|Location||South East Asia|
|Area||4,030 km2 (1,556 sq mi)|
|Population||30-35,000 (as of 2001)|
|Density||7.5 /km2 (19.4 /sq mi)|
|Ethnic groups||Mentawai. 10% of the population are from other parts of Indonesia.|
Coordinates: Siberut is the largest and northernmost of the Mentawai Islands, lying 150 kilometres west of Sumatra in the Indian Ocean. A part of Indonesia, the island is the most important home for the Mentawai people. The western half of the island was set aside as the Siberut National Park in 1993. Much of the island is covered with rainforest, but is subject to commercial logging.
The island is known for its range of primates, including the Kloss Gibbon (Hylobates klossii), pig-tailed langur (Simias concolor), Mentawai Langur (Presbytis potenziani) and Mentawai Macaque (Macaca pagensis).
Siberut Island has a hot and humid tropical rainforest climate, with an annual rainfall of 4,000 mm. Temperatures range from 22 to 31 °C, and humidity averages 81-85%. The east coast has many islets, bays and coral reefs, and is covered with mangrove forest extending up to 2 km wide before giving way to nipah forest. The west coast features mainly Barringtonia forests and is difficult to get to because of rough seas and steep cliffs. The hilly interior elevates to 384 metres, with many streams eventually forming rivers in the sago-grove lowlands and swamp forests. There are also areas of dipterocarp primary forest.
Siberut has been isolated from the mainland Sunda shelf since the Mid-Pleistocene. This isolation has led to a much biodiversity, with about 900 species of vascular plants and 31 mammal species. Sixty-five percent of mammals and fifteen percent of other animals are endemic at some taxonomic level, making Siberut unique. Of the 134 bird species found on Siberut, 19 are endemic at some taxonomic level. There are 4 endemic primates, Bokkoi (macaca pagensis), Lutung Mentawai/Joja (presbytis potenziani siberu), Bilou (hylobates klossii) and Simakobu (naasalis concolor siberu).
Siberut was recognized as a Biosphere Reserve in 1981. In 1993, the western part of the island was designated as a National Park, covering an area of 1,905 km².
About 70% of the remaining forest outside the reserve is subject to logging concessions, some operative and others pending.
In 2001, UNESCO brought in a new phase of its Siberut Programme, with the intention of protecting the ecosystem through local development. This phase involves creating a partnership of local communities, conservation groups and local government, an approach which appears to be popular locally. However, poor governance and corruption has led to substantial illegal logging.
Some anthropologists believe that several thousand years ago, the Bataks of North Sumatra may have been the first to settle here. However, there are now substantial differences in culture and language among the inhabitants. The Swiss anthropologist, Reimar Schefold spent years among one of the Siberut groups, the Sakuddei.
In the west of the island, there is a tradition of communal long houses known as uma.
- Siberut World Biosfer
- "Siberut Island". indonesia-tourism.com. Retrieved 1 November 2010.
- McNeely, Jeffrey A.; Sochaczewski, Paul Spencer (1995). Soul of the tiger: searching for nature's answers in Southeast Asia. University of Hawaii Press. p. 161. ISBN 0-8248-1669-2.