
Hin Muang (Purple Rock) This limestone pinnacle stretches for more than 200 meters in length and in some places is less than 20 meters in width. The almost vertical walls are carpeted with anemones and colorful sea fans and the numerous little caves, ledges, and rocky outcroppings provide shelter for virtually every underwater creature found in Southeast Asia, and seems to be a magnet for every Manta Ray in the region, with Mantas regularly in groups of 5 or more hanging out here for days.