Ulu Kalumpang
Ulu Kalumpang Forest Reserve is a refuge for the endangered iconic animals of Borneo and serves to protect the headwaters and water catchment areas that are a source of water for the inhabitants of the Tawau Peninsula. The reserve is 35km from bustling Tawau, Sabah’s third largest town.

Ulu Kalumpang was first announced as a forest reserve in 1956 as a block of land about 862 km square. From 1959-1979 the land was de-reserved by 335 km square. It was reclassified as a Class Two Forest Reserve in 1984, and eventually in 1992 it progressed into a Class One Forest Reserve with a final area of 511 km square. Ulu Kalumpang is linked to other forest reserves - in the south it links with Tawau Hills National Park and Mount Wullersdorf Forest Reserve as well linking to the Ulu Segama Forest Reserve. These reserves have been linked in hopes of reuniting wildlife that have become isolated due to human activity and to provide sound management for securing the animals long term survival.

Ulu Kalumpang is in an area called the Tawau Highlands and is very mountainous. It is covered in five main forest types, 70% of which is lowland mixed dipterocarp forest, the rest is made up of upland mixed dipterocarp forest, lowland mixed & kerangas forest and a small portion consists of lower montane forest. There are several rivers running through the park, the main one is Kalumpang River; its tributaries being the Mantri and Malati Rivers. Others include Binung River which flows into the Tingkayu and finally the Merutai Kanan which flows southwards from the reserve.

An estimated 180 species of birds are present in the park, which makes it an important site for lowland forest species in Sabah, especially for hornbills (six species) and pheasants. This park is also a safe haven for the Orang Utan whose numbers are around 150 individuals with Ulu Kalumpang, as well, the endangered Borean Pygmy Elephant and Sumatran Rhino are found roaming in this part of Sabah.  Other animals prevalent to the area include various types of deer, wild boars and several species of monkeys such as the Bornean Gibbon, Long-tail and Short-tail Macaques and the Redleaf Monkey.
There are no facilities within the park and no accommodation is available. In Tawau there are several budget and mid-range guest houses that are suitable to spend the night if you want to spend a day in the reserve.