Koh Rong Nang is a Samaesan reef where the tide decides which side gives the cleaner run. The site slopes off the island into shallow rocky sections, coral lines, and a flatter seabed, so it rewards divers who can read the current instead of fighting it. It is usually reached by boat and fits best as a current-aware reef dive with strong fish life and good photo potential. The calm, clear-water side of the reef is also used on snorkeling tours when conditions line up.