The Rungan River Peat Swamp Forest is a vast mosaic of threatened peat swamp and lowland rainforest in southern Borneo. Fruit-rich peat swamps support very high densities of Bornean Orangutans, and this area is home to 2,000 individuals (4 percent of the global population). The area also supports substantial populations of other imperiled endemic species such as the Endangered Bornean White-bearded Gibbon and Proboscis Monkey as well as the rare Flat-headed Cat and the bizarre Otter Civet.

The Rungan River landscape is one of the largest regions of lowland forest in Kalimantan (Indonesian Borneo) that is currently unprotected and at grave risk of destruction. In addition, Rungan is at risk from conversion to oil palm and acacia plantations, so immediate action is required to protect this key area. Rainforest Trust and local partner Borneo Nature Foundation seek $778,686 to permanently overturn logging concessions and designate 385,000 acres as a permanent protected area.