Boulder City
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
Boulder City sits off Koh Rong Samloem, one of the larger islands off Sihanoukville in southern Cambodia's stretch of the Gulf of Thailand. The site takes its name from the granite boulder formations scattered across the seabed, with a rock bottom reaching a maximum depth of around 40 metres and rated an advanced dive. Divers have reported strong currents moving through the boulders, along with sightings of barracuda, bumphead parrotfish, eagle rays, manta rays, Napoleon wrasse, and pipefish.
AI overviewMarine life here
Confirmed by our research team, reported by independent divers, or observed nearby via iNaturalist — each entry is labelled with its source.
Eagle rayEagle rayReported here · unconfirmed
BarracudaBarracudaReported here · unconfirmed
Eightband ButterflyfishChaetodon octofasciatusReported here · unconfirmed
Argus WrasseHalichoeres argusReported here · unconfirmed
Copperband ButterflyfishChelmon rostratusReported here · unconfirmed
Viola Land Hermit CrabCoenobita violascensReported here · unconfirmed
Pastel-green WrasseHalichoeres chloropterusReported here · unconfirmed
Boring Giant ClamTridacna croceaReported here · unconfirmed
Bengal SergeantAbudefduf bengalensisReported here · unconfirmed
Black Longspine UrchinDiadema setosumReported here · unconfirmed
PipefishPipefishReported here · unconfirmed
Napoleon (humphead) wrasseNapoleon (humphead) wrasseReported here · unconfirmed
Bumphead parrotfishBumphead parrotfishReported here · unconfirmed
Manta rayManta rayReported here · unconfirmed
Banded Sea UrchinEchinothrix calamarisObserved near here · iNaturalist
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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