Ulu Temburong National Park, National park in Temburong District, Brunei.

Ulu Temburong is a national park in Brunei's eastern district covered by dense rainforest with rivers flowing through its landscape. The terrain consists of forested hills at varying elevations that support diverse wildlife habitats.

The park was established in 1991 as Brunei's first protected forest area. Since then it has developed into an important site for forest research and conservation work.

The park's name comes from the Malay word ulu, meaning headwaters, referring to the upper Temburong River. Longboats into the park are piloted by experienced Iban boatmen who read the sand bars, logs and boulders of the river. The Kuala Belalong Field Studies Centre, set up by Universiti Brunei Darussalam in 1990 about 500 m from the mouth of the Belalong River, runs school environmental education programmes.

Visiting requires boat transfers and overland transport to reach the park interior, so allow extra time for travel and connections. Waterproof clothing and sturdy shoes are essential since trails can be muddy and the climate is very humid.

An elevated walkway leads through the forest canopy offering rare views of animals that normally stay high in the treetops. From this vantage point, gibbons and other forest dwellers can be spotted in a way rarely seen up close.