Crabby is a boat dive from M'Pai Bay on Koh Rong Sanloem that draws divers for an easy reef outing with solid macro life. The dive begins over sand with scattered rock, then turns into a coral-coated rocky corner, so the route changes from open bottom to a more textured reef edge. Plan on a boat ride and a relaxed but not fully sheltered profile, because a light current can show up on ordinary days. Expect reef fish, nudibranchs, octopus, and occasional stingrays working the sand.