Located in the south-west tip of Yunnan province, in south-west of China, Xishuangbanna Biosphere Reserve borders Laos to the east and Myanmar to the west (Mekong region or upper Mekong basin). Currently, it comprises the largest and most comprehensive tropical forest in China. Due to its unique geographic and climate aspect, it contains the richest biodiversity in China. Although the area occupies less than 1/5,000,000 of China, it comprises 4,000 vascular plant species, 102 mammal species, 400 bird species, 63 reptile species, 38 amphibian species and 100 fish species. Besides, more than 90% of China wild elephant population is living in this region.