Hin Daeng & Hin Muang Dive Guide — Thailand's Deepest Walls

Hin Daeng is a limestone pinnacle whose top breaks the surface. The signature dive is the south wall — a sheer vertical face dropping from 10 meters to beyond 60 meters, blanketed in red and orange soft corals that give the rock its name. Manta rays are regularly seen gliding along the wall or circling at cleaning stations near the top. Grey reef sharks patrol at 25–35 meters. The west side offers a more gradual slope with coral gardens and schools of fusiliers.

Hin Muang is fully submerged, with its highest point at approximately 8 meters. It is the deeper of the two sites, with walls extending beyond 70 meters — making it Thailand's deepest named dive site. The rock is covered in purple soft corals (hence the name), and the sheer scale of the walls is breathtaking. Manta encounters are common here as well. At depth, look for leopard sharks on the sand at the base of the walls and large Napoleon wrasse cruising mid-water.

The two sites are approximately 400 meters apart and are typically dived as a pair — one dive at each. Surface intervals are spent on the boat between the sites. Day trips from Koh Lanta take about 2.5–3 hours by speedboat each way, making for a long but rewarding day. Liveaboards from Phuket reach the sites as part of southern itineraries that also include Koh Haa and Phi Phi.

Current conditions at both sites are variable and can change rapidly. The exposed open-ocean location means there is no prediction — divers must be prepared for anything from still water to washing-machine conditions.

Experienced wall divers who appreciate dramatic topography and manta encounters. Technical divers exploring the deep walls. Photographers seeking wide-angle wall shots with soft coral colour. Not for beginners or newly certified Advanced divers — the depth, currents, and exposure demand solid experience.

November–April, with peak conditions and manta sightings February–April. Day trips from Koh Lanta operate when sea conditions allow. Liveaboards include these sites on southern Andaman itineraries during the full season.