Koh Mannai
Conditions & tides
Scored by DiveConnect's site-physics model
Marine forecast via Copernicus Marine. Score is a rule-based guide from swell/wind vs. the site's exposure — always dive your own assessment.
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About this site
Koh Mannai is a small island off the coast of Rayong Province, in the Gulf of Thailand, within reach of mainland dive operators based around Rayong town. The site is a wall dive reaching a maximum depth of around 25 metres and is rated advanced. Divers here have reported sightings of ashy pink and black sea cucumbers, bengal sergeants, blackblotched porcupinefish, eightband butterflyfish, mottled lightfoot crabs, spanish flag snapper, barracuda, grouper, and trevally.
Marine life here
Confirmed by our research team, reported by independent divers, or observed nearby via iNaturalist — each entry is labelled with its source.
Bengal SergeantAbudefduf bengalensisReported here · unconfirmed
Ashy Pink Sea CucumberHolothuria (Stauropora) fuscocinereaReported here · unconfirmed
Spanish Flag SnapperLutjanus carponotatusReported here · unconfirmed
Black Sea CucumberHolothuria leucospilotaReported here · unconfirmed
Mottled Lightfoot CrabGrapsus albolineatusReported here · unconfirmed
Eightband ButterflyfishChaetodon octofasciatusReported here · unconfirmed
Blackblotched PorcupinefishDiodon liturosusReported here · unconfirmed
BarracudaBarracudaReported here · unconfirmed
TrevallyTrevallyReported here · unconfirmed
GrouperGrouperReported here · unconfirmed
Durable tips from divers — access, hazards, marine life, facilities. For day-of conditions, use the report tool in the conditions card above.
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