

Best for advanced divers, Up to 28m, boat entry, strong current.
Secret Reef in the Koh Rong Archipelago is a challenging site requiring an Advanced Open Water certification. The topography consists of a reef structure reaching depths of 28 metres, characterised by sharp coral and rock formations that necessitate precise buoyancy control. Divers must access the site by boat. Conditions are variable, with visibility ranging from 5 to 25 metres and strong currents that fluctuate with tidal movement. Water temperatures remain consistent between 29 and 31 degrees Celsius throughout the year. Due to the presence of sharp coral and strong currents, divers should coordinate closely with their boat crew to assess conditions before entry.
10.64240, 103.30590
Check current direction and strength with your boat crew before descending, as the flow can change significantly with tidal movement and will dictate your entry point and dive plan. Thick gloves are worth considering given the sharp coral, but confirm local regulations on touching the reef before suiting up.
The offshore reef is located a few kilometres north of Sunset Beach on the west side of Samloem Island.
Recorded at this site
Depth
Up to 28m
Visibility
5-25m
Skill Level
Advanced
Entry
Boat
Boat required
Water Temp
29-31°C
Current
Strong
Best Time
Jan, Feb, Mar, Dec
This site is suitable for advanced divers only, as it requires an Advanced Open Water certification due to strong currents and complex reef topography.
The reef structure extends from the surface to a maximum depth of 28 metres.
Secret Reef is accessible by boat only.
Visibility ranges from 5 to 25 metres, and water temperatures are between 29 and 31 degrees Celsius. Strong currents are common and vary with the tide.
The site features sharp coral and rock formations, which pose a risk of injury. Strong currents also present a significant hazard for divers.
Diving at Secret Reef in Sihanoukville requires the following certifications: Advanced. Always dive within your training limits.
A rashguard or 2mm shorty is recommended for diving at Secret Reef in Sihanoukville. Water temperatures range from 29°C to 31°C.
The best months to visit Secret Reef in Sihanoukville are January, February, March, and December. Conditions outside these months can still be good but are less predictable.