Ulu Kalumpang Forest Reserve is a region in

Sabah Sabah () is a States and federal territories of Malaysia, state of Malaysia located in northern Borneo, in the region of East Malaysia. Sabah has land borders with the Malaysian state of Sarawak to the southwest and Indonesia's North Kalima ...

Malaysia Malaysia is a country in Southeast Asia. Featuring the Tanjung Piai, southernmost point of continental Eurasia, it is a federation, federal constitutional monarchy consisting of States and federal territories of Malaysia, 13 states and thre ...

. Located on the Tawau Peninsula, it was designated as a conservation area by the Sabah Forestry Department in 1992. The forest reserve is in an area called the Tawau Highlands, which also includes

Tawau Hills National Park Tawau Hills Park, was established in 1979, primarily as a protection for the water catchment area of Tawau town, Sabah, Malaysia. It is located 24 kilometres from Tawau, and comprises 279.72 km² of lowland dipterocarp rainforest, surroun ...

. The forest reserve is very mountainous, especially towards the south. A statewide orang-utan census carried out by HUTAN (an NGO based in Sukau, Kinabatangan) and the Sabah Wildlife Department estimated an

Orang-utan Orangutans are great apes native to the rainforests of Indonesia and Malaysia. They are now found only in parts of Borneo and Sumatra, but during the Pleistocene they ranged throughout Southeast Asia and South China. Classified in the genus ' ...

population density of 0.42 individual/km² within the forest reserve. This orang-utan population of ~ 183 individuals is totally isolated and its long-term survival is insecure.

References

Forest reserves of Sabah Borneo montane rain forests Borneo lowland rain forests {{Sabah-geo-stub