Batang Duri is an Iban longhouse on the Temburong River. You can visit it, but you should introduce yourself to the chief first. From Batang Duri, it is possible to catch a boat to the Kuala Belalong Field Studies Center, where tropical rainforest species are researched. It is set amid a tropical rainforest, which houses countless animal and plant species. Walking trails run through the forest and there is also a zoo, where you can see civets, monkeys and otters, as well as various birds. The zoo is called Taman Batang Duri.

Batang Duri is about 40 km southwest of Bandar Seri Begawan. At the Kuala Belalong Field Studies Center, limited accommodation is available.