Ulu Temburong National Park occupies approximately 50,000ha of the Batu Apoi Forest Reserve. The park's locality and steep, swampy terrain have limited human impact on the area and helped preserve its rich biodiversity.

Established forest trails through the park include 7km of wooden walkways which protect ground vegetation and help prevent erosion. A canopy walkway affords visitors an opportunity to observe the rainforest's surprisingly diverse treetop ecosystems.

In addition, a series of treehouses some 20m above the ground, and linked by hanging bridges, provides excellent observation points.

Ulu Temburong Park Headquarters Information Centre, including staff quarters and a surau (prayer hall), is located at the confluence of the Temburong and Belalong Rivers. Access to the park is by temuai or longboat, and visitor accommodation within the park consists of some seven guest houses and three well-equipped campsites.