Marine-fisheries zoning proposal that references Secret Reef in the Koh Rong, Koh Rong Samloem, and Koh Koun area.
Deep reef with current and shark potential.
Deep reef with current and shark potential.
The site is hard to locate and should be handled by a local crew with current and depth experience.
Secret Reef is a deep, current-affected reef of scattered rock patches and coral shelves that suits advanced divers looking for structure and shark potential. It is a specialist site rather than a casual cruise.
Conservative baseline from public research. No community dives logged yet.
Depth range, seasonality, and planning context.
Reported Depth
Up to 28m
Depth Note
Maximum depth is 28 m; public pages describe it as the deepest dive site and recommend advanced or deep certification.
Best Season
November to April
Typical Conditions
Current is present at the site, which is built from scattered rock patches and shelves rather than a mellow shallow reef.
Hazards, restrictions, and access requirements.
Key Hazards
Safety Notes
Current and depth require appropriate training; recommended only for advanced/deep certified divers.
Access Restrictions
Advanced or deep certification recommended; protected-site guidance should be checked before the dive.
Legal Notes
Public pages describe the site as a conservation and marine-management area where local guidance matters, especially because current and depth require appropriate training.
Community notes to help plan your visit.
Scuba Diving
Deep dive with current and a 28 m max depth; suited to advanced or deep-certified divers.
Community dive logs and visit reports for this site.
Average conditions based on logged dives & visits.
Planning answers for access, conditions, timing, and site logistics.
Last Updated
Research Sources
Marine-fisheries zoning proposal that references Secret Reef in the Koh Rong, Koh Rong Samloem, and Koh Koun area.
Day-trip operator page that lists Secret Reef among the Koh Rong Samloem and Koh Koun sites.
News report discussing the marine park expansion that includes the Secret Reef area.
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