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 . [ 70 ] Other key habitats include the dry forest of Mondolkiri