Some disagreement about the name of this island as this and the adjacent Koh Kra are swapped around on National Park and Thai Navy maps of the area. And if they can’t agree then there’s really no hope. But I’ve gone with Koh Thian as that is what my old map of the area also says this island is called and this corresponds to the more detailed naval map. Regardless, it is a lovely spot for snorkelling with some very shallow water on the eastern side and plenty of rocks and corals on the west. Above the surface there’s nothing of interest, it is more a small rocky outcrop rather than a real island.
Worth Visiting? Definite Yes. In the past snorkel trips stopped here but technically the island is closed to allow coral rehabilitation. So may not be possible to visit.