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Koh_Doc_MaiThe east side of the island offers a wall rich in invertebrates and a good representation of tube corals. There are large moray eels, black-banded sea kraits, honeycomb groupers and angelfish, and you’ve a good chance of seeing leopard sharks out on the sand. Bivalves cling to sea whips along the deeper sections of the wall, which also features two caves.

The walls and ceiling of the larger one are rich in soft corals, but it’s best to remain outside, exploring the cave’s interior safely by torch light. The western side of the island features a steeply sloping reef rather than the sheer drops that dominate elsewhere. Black-tip and white-tip reef sharks can be seen. There are healthy sea fans and barrel and encrusting sponges. Visiting pelagic often pass by.