The Leuser Ecosystem is an area of forest located in the provinces of Aceh and North Sumatra on the island of Sumatra in Indonesia. Covering more than 2.6 million hectares it is one of the richest expanses of tropical rain forest in Southeast Asia and is the last place on earth where the Sumatran elephant, rhino, tiger and orangutan are found within one area.[1] It has one of the world's richest yet least-known forest systems,[2] and its vegetation is an important source of Earth's oxygen.[3] Leuser also possesses more lowland rainforest than the rest of Sumatra combined and supports some of the last viable populations of tiger, rhino, orangutan and elephant.[4] These, and many co-occurring species, are severely threatened by habitat destruction and poaching. [5]