Bukit Batu Biosphere Reserve

Giam Siak Kecil-Bukit Batu (Indonesian: Cagar Biosfer Giam Siak Kecil Bukit Batu or CB-GSK-BB) is a peatland area in Riau Province of Sumatra, covering 705,271 hectares (2,723.07 sq mi) and large parts of Bengkalis Regency and Siak Regency. It is a declared UNESCO Man and the Biosphere Reserve and supports a sustainable timber industry. It is home to two wildlife reserves, namely Giam Siak Wildlife Reserve and Bukit Batu Wildlife Reserve; flagship species include the Sumatran elephant and Sumatran tiger.

The biosphere reserve is located in a province that has seen widespread forest destruction. Extensive logging has led to a decline in forest cover from 78% in 1982 to 33% in 2005; further reduction, at an average rate of 160,000 hectares per annum, has resulted in 22% left as of 2009.Deforestation has left the region vulnerable to intensifying flooding and landslides and has supported the highest of Indonesia's provincial population growth rates due to migration. Cleared land for palm oil and paper has led to not only perennial haze over the province, but also in Kuala Lumpur in Malaysia. The UNESCO Man and the Biosphere Reserve was created in 2009.

The reserve houses an estimated 189 species of plants, 29 of which are classified as endangered under CITES, Appendix 1 and 3. Peat swamp forest flora are dominant. Several species of animals found in the reserve are classified as endangered under CITES Appendix 1 including the Sumatran elephant (Elephas maximus) and Sumatran tiger (Panthera tigris sumatrae), two species of birds, and one fish. Other flagship species include the sun bear, clouded leopard, marbled cat, Malayan tapir, and hairy-nosed otter. 162 species of moth are an important "indicator" of forest condition.

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