Spectacular Khao Sok National Park is one of the highlights of a visit to southern Thailand. Dotted with lush limestone mountains and filled with tropical rainforest, lakes, rivers and waterfalls, Khao Sok is home to a staggeringly diverse range of wildlife and plants. Covering an area of more than 700 square kilometres, this tropical wonderland in Surat Thani province was formally established as a national park in 1980.