To reach the park, visitors travel by longboat along jungle rivers - the water is so clear you can see right to the bottom. The forest begins right at the riverbank, with giant roots tangling down into the water and huge leaves hanging overhead. It already feels magical before you set foot on land.
Inside the park, a famous canopy walkway leads you up to the very tops of the tallest trees. When you reach the top, you can see a green sea of treetops stretching to the horizon in every direction. Macaque monkeys swing between the branches below you and butterflies the size of your hand flutter past.
Scientists love Ulu Temburong because the forest has almost never been disturbed by people. That means the soil, insects, plants, and animals all work together exactly as they have for thousands of years. It is like a living library of how rainforests are supposed to work - and Brunei is very proud of keeping it that way.