Ulu Temburong National Park is the first national park to be established in Brunei, protected since 1991. The park is in Temburong District in eastern Brunei, and covers about 40% of the district in the south at 550 square kilometres (210 sq mi). It is within the Batu Apoi Forest Reserve. The park contains unspoiled jungle and is known as the "Green Jewel of Brunei", described as "the finest example of the sultanate's successful forest protection policy". The principal rivers are the Temburong and Belalong Rivers. It is an important ecotourism centre in Brunei and hosts the Ulu Ulu Resort. The Peradayan Forest Reserve is also located in the district.