

Best for advanced divers, 5-35m, boat entry, moderate current.
Western Rocky Island is a diverse dive site in the Surin Islands offering a combination of reef, wall, pinnacle, and cavern topography. Depths range from 5 to 35 metres with an average of 22 metres, making it suitable for advanced divers. Visibility is typically between 20 and 40 metres. The site features cavern sections that present an overhead environment, requiring appropriate training and a torch. Currents are generally moderate but can shift quickly, necessitating careful monitoring and the use of a surface marker buoy. Access is by boat only, and the site is suitable for night diving.
9.86052, 97.86979
Plan your entry around slack water if possible, as the currents at Western Rocky Island can shift quickly and affect both the cavern sections and the deeper wall. Confirm current conditions with your boat operator on the day, and carry a surface marker buoy given the boat-access-only nature of the site.
Located in the southernmost part of the Mergui Archipelago.
Recorded at this site
Depth
5-35m
Visibility
20-40m
Skill Level
Advanced
Entry
Boat
Boat required
Water Temp
27-30°C
Current
Moderate
Typical Dive
60 min
Best Time
Year-round
No, this site is intended for advanced divers due to the presence of overhead cavern environments and variable currents.
The site ranges from 5 to 35 metres in depth, with an average depth of 22 metres.
Western Rocky Island is a boat-access-only site located 85 kilometres from shore.
The site is primarily designed for diving, particularly given the depth range and the overhead cavern environments.
Hazards include an overhead environment within the caverns and moderate currents that can strengthen with little warning.
Diving at Western Rocky Island in Mergui Archipelago requires the following certifications: Advanced. Always dive within your training limits.
A rashguard or 2mm shorty is recommended for diving at Western Rocky Island in Mergui Archipelago. Water temperatures range from 27°C to 30°C.
The best months to visit Western Rocky Island in Mergui Archipelago are January, February, March, April, May, June, July, August, September, October, November, and December. Conditions outside these months can still be good but are less predictable.
Expect moderate currents at Western Rocky Island in Mergui Archipelago. Good buoyancy control and some drift diving experience is helpful.
Visibility at Western Rocky Island in Mergui Archipelago typically ranges from 20 metres to 40 metres. Conditions vary with weather, tides, and seasons.