Orimas Thila is an elongated, submerged reef , the shallowest part of which is at about 5m. There is a sea anemone field at about 15m on the eastern end. On the northern side there are superb caves, overhangs and reef cracks.
Underwater scenery, corals, soft corals, and sea anemones, small fishes. White-tipped shark and whale shark sometimes spotted. Turtle and Manta rays rarely found.