It is located at Km. 626 of Highway No. 4 (the way to Phangng), 12 km. from Ranong. Ngao Waterfall is a big waterfall, which its whole stream cascades from a high mountains and pastures is visible from the resting area near the fall. Furthermore there is a new species of the freshwater crabs endemic to Thailand, ‘Pu Chao Fa], found only in the area around Namtok Ngao.