Betung Kerihun National Park () is a national park located in the Indonesian province of West Kalimantan, on the island of Borneo. The park was established in 1995, and has a total area of or about 5.5 percent of West Kalimantan Province area. Together with the Lanjak Entimau Wildlife Sanctuary in Malaysia, it has been proposed to form a World Heritage Site named the "Transborder Rainforest Heritage of Borneo". Topography and ecology Betung Kerihun National Park is hilly and mountainous, with altitudes ranging from to almost . The topography is characterized by steep slopes, with more than half of the park area having slopes over 45%. The highest peaks are Mount Kerihun () and Mount Lawit (). The park is located at the headwaters of the Kapuas River. The park largely consists of two ecoregions, Borneo montane rain forests, which covers about 2/3 of the area, and Borneo lowland rain forests. Flora and fauna In the lowland forests the dominant emergent trees are dipterocarp species, which are replaced at higher altitude with oaks (Quercus and Lithocarpus ssp.) and chestnut trees (Castanopsis ssp.). At least 97 species of orchid and 49 species of palm have been identified in the Park. The fauna of the park is rich, with 300 species of bird (25 endemic to Borneo), at least 162 fish species and at least 54 mammals. The park is home to endangered Bornean orangutan and seven other primate species: Müller's Bornean gibbon, white-fronted surili, maroon leaf monkey, southern pig-tailed macaque, crab-eating macaque, Sunda slow loris and Horsfield's tarsier. Human habitation Several Dayak tribes, including Dayak Iban, Dayak Taman, and Dayak Bukat live in the park. There are 12 villages in and around the park, 2 of which are located inside the park (Nanga Bungan and Tanjung Lokang) and 6 are adjacent to the park boundary. They live from hunting, collecting non-timber forest products and subsistence farming based on a pattern of shifting cultivation. Conservation and threats Betung Kerihun National Park was first established as a 600,000 ha nature reserve in 1982 by a Ministry of Agriculture decree. The size was enlarged to 800,000 ha in 1992 and the conservation status was changed to national park in 1995. The Betung Kerihun Park Management Unit was formally launched by the Minister of Forestry in 1997. Currently, it has 57 full-time staff and 20 honorary members. Among these, 24 park rangers are responsible for