Maps Ulu Temburong Maps: Ulu Temburong National Park Date: May 29, 2017Author: uluulublog Ulu Temburong National Park, Brunei Darussalam. 50,000 ha of pristine rainforest in the heart of Borneo. Brunei Darussalam is on the island of Borneo in the heart of South East Asia’s tropical rainforest. Share this:TwitterFacebookGoogleLike this:Like Loading...