Ulu Temburong National Park is situated in the extreme east of Brunei Darussalam, in the Temburong District. It is bounded by three other districts and the Sarawak state of Malaysia. It is a lowland rainforest covering an area of 212 square miles (550 km2).[2][6] [7] The park area is in the upper region of the eastern part of Brunei. The southern part consists of a hilly region with mountains rising to a height of 1,800 metres (5,900 ft) and the lowlands are in the northern slopes. The terrain is traversed by a number of rivers forming narrow valleys and includes the coastal region.[8]
The park, which can only be reached by river, is only accessed by longboats[9] from Brunei's capital city of Bandar Seri Begawan. The first destination by boat is Bangar town where the Limbang River emerges from Sarawak and drains into Brunei Bay with mangrove muddy deltas at the estuary. Travel from Bangar town to Batang Duri is by road and it is the starting destination for travel by longboats along the Temburong River into the Park. The boats are plied by experienced Iban people winding through sand bars, logs and boulders. An extensive network of boardwalks, bridges and stairways, 7 kilometres (4.3 mi) in length,[9] have been constructed to visit all regions of the park. Interpretation boards provide information along the way.[9] There is also a canopy viewing walkway. This walkway, built with steel towers supporting the cable way, rises to height of 50 metres (160 ft) above the forest floor overlooking the highest tree canopy and provides vistas of the forests.[6]