[2] The park contains unspoiled jungle and is known as the "Green Jewel of Brunei",[3] described as "the finest example of the sultanate's successful forest protection policy".

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 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.

An extensive network of boardwalks, bridges and stairways, 7 kilometres (4.3 mi) in length,[10] have been constructed to visit all regions of the park.

[7] Vegetation in the reserve is in the form of tropical lowland rain forests with the Shorea, Dryobalanops and Dipterocarpus genera as the dominant species of trees.

Other notable discoveries of animals found on the park are the Belalong tree frog (Leptomantis belalongensis) and the earless monitor lizard (Lanthanotus borneensis).

The area was under his private authority as part of Sarawak during the colonial era; the male species have jet black wing colour and emerald green banding.

[7] A 70,000 ha tract of land, encompassing the park and extensions to the Batu Apoi Forest Reserve, has been identified by BirdLife International as an Important Bird Area (IBA) because its forest habitats support significant numbers of various threatened bird species, including Bornean crestless firebacks, large and cinnamon-headed green pigeons, lesser adjutants, Storm's storks, mountain serpent eagles, Wallace's hawk-eagles, Malay blue-banded kingfishers, blue-headed pittas, straw-headed bulbuls, chestnut-crested yuhinas, Bornean wren-babblers, grey-chested jungle flycatchers and large-billed blue-flycatchers.

There are three room categories; Standard (dormitory), Superior (twin share and family suites) and Deluxe (double bed).

To stay at the resort, visitors are required to make advance booking of a Ulu Temburong National Park tour package, to and from Bandar Seri Begawan.

The partnership was forced to suspend operation on 20 June 2020 due to the Covid-19 Pandemic despite aid from the Ministry of Finance & Economy's support[16]