These relatively isolated mountains are part of the Cardamom Mountains rain forests ecoregion, an important ecoregion of mostly tropical moist broadleaf forest. Being one of the largest and still mostly unexplored forests in Southeast Asia, it is separated from other rainforests in the region by the large Khorat Plateau to the north. For these reasons, the ecoregion is home to several endemic species and is a refuge for species who has been decimated or are endangered elsewhere. The Vietnamese Phú Quốc island off the coast of Cambodia has similar vegetation and is included in the ecoregion.