Koh Bon Pinnacle
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 Bon Pinnacle, also called Hin Luang or Yellow Rock, is a huge submerged rock about 200 metres off the west ridge of Koh Bon island in Thailand. Its summit sits at 18 metres, and it drops to over 40 metres, and in places past 50. Dark volcanic rock is covered in bright yellow soft corals.
No buoy or line marks the pinnacle, and fairly strong currents often run, so the dive begins with a negative entry to reach the rock quickly and shelter from the current. That and the depth make it a dive for experienced divers only. From the deep drop-off on the north side a long swim at 28 to 30 metres leads to the reef.
It can be very good for mantas and sharks. A cave full of nurse sharks was found here a couple of years ago. Soft coral trees, gorgonian sea fans and barrel sponges grow on it, and the best months are January to April.
Marine life here
Confirmed by our research team, reported by independent divers, or observed nearby via iNaturalist — each entry is labelled with its source.
ClownfishClownfishReported here · unconfirmed
Titan TriggerfishBalistoides viridescensReported here · unconfirmed
Moorish IdolZanclus cornutusReported here · unconfirmed
Red-tailed ButterflyfishChaetodon collareReported here · unconfirmed
Giant MorayGymnothorax javanicusReported here · unconfirmed
Graeffe's Sea CucumberPearsonothuria graeffeiReported here · unconfirmed
Three-spot DascyllusDascyllus trimaculatusReported here · unconfirmed
Oriental SweetlipsPlectorhinchus vittatusReported here · unconfirmed
Black Pyramid ButterflyfishHemitaurichthys zosterReported here · unconfirmed
Emperor AngelfishPomacanthus imperatorReported here · unconfirmed
GrouperGrouperReported here · unconfirmed
Nurse sharkNurse sharkReported here · unconfirmed
Manta rayManta rayConfirmed present · 4 independent sources
BatfishBatfishReported here · unconfirmed
GuitarfishGuitarfishReported here · unconfirmed
Leopard / zebra sharkLeopard / zebra sharkConfirmed present · 3 independent sources
TrevallyTrevallyConfirmed present · 2 independent sources
Whale SharkRhincodon typusConfirmed present · 3 independent sources
TunaTunaReported here · unconfirmed
BarracudaBarracudaReported here · unconfirmed
Varicose Wart SlugPhyllidia varicosaObserved near here · iNaturalist
Oceanic Manta RayMobula birostrisObserved 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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