Protected areas of Brunei are established by the Government of Brunei, in accordance with national development objectives and global biogeoecological strategies in which forests play an important role. The country's marine protected areas remained at 0.2% in 2022. As of 2011, nearly half of Brunei Darussalam is still primary forest, however this coverage is dwindling and only 17% of the country is officially protected.

Merimbun Lake is the largest natural lake in Brunei. It is located near Mukim Rambai in the Tutong District, about 70 km from the capital, Bandar Seri Begawan. The S-shaped lake is located 27 km from Tutong Town and it is surrounded by the 7800-hectare Tasek Merimbun Heritage Park.