KohMook is the third largest island of Trang Sea taken care by Had Chao Mai National Park, KohLibong, Sub District, Kantang District. The island's feature is of high cliffs and rocks facing the open sea at the western coast. The island's eastern coast is the plain with the cape heading towards the main land where Ban KohMuk is Located in between the sea. One side is HuaLaem Beach and Sapanyao Pier while the other side is Phangka Bay. Swimming can be done along the shoreline, the area of fertile seaweed which is the delicious food for the dugong (sea cow).