The Tonle Sap Biosphere Reserve is a reserve surrounding the Tonle Sap lake. It encompasses the lake and nine provinces: Kampong Thom, Siem Reap, Battambang, Pursat, Kampong Chhnang, Banteay Meanchey, Pailin, Oddar Meanchey and Preah Vihear. In 1997, it was successfully nominated as a UNESCO Biosphere Reserve. Other key habitats include the evergreen and dry Dipterocarp forests of Mondolkiri province, protected by Keo Seima Wildlife Sanctuary, Phnom Prich Wildlife Sanctuary, and Srepok Wildlife Sanctuary, as well as Ratanakiri province, and the Cardamom Mountains ecosystem, including Preah Monivong National Park, Botum-Sakor National Park, and the Phnom Aural Wildlife Sanctuary and Phnom Samkos Wildlife Sanctuary.