Ko Muk and Tham Morakot (เกาะมุก-ถ้ำมรกต) are the most prominent points in the Trang Sea. Ko Muk is mostly occupied by sea-facing towering cliffs to the west. Located on the eastern side of the island is a village of fishermen who have still maintained their ways of life as islanders. On the island to the west is Tham Morakot, a unique sea cave. With light from the outside, emerald water can be seen inside the cave; it is unusual and beautifully nature.