Khao Sak is an ancient evergreen rainforest
believed to be as old as 160 million years and covering a huge 739 square kilometres. It features rich rain-forests, wildlife sanctuaries, limestone structures, and the scenic Cheow Larn Lake in the heart of the park. Throughout the region, the ground level is about 200 metres above sea level with the average mountain heights being around 400 metres, with the tallest peak towering at 960 metres high.