Tachai Reef
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
Tachai Reef is a gentle slope on the east side of Tachai Island, about 25 km north of Bon Island in the Similan Islands. White sand is dotted with coral blocks, with a maximum depth of 30 m and an average of 15 m. The current is gentle and visibility runs from 15 to 40 m.
The site is nicknamed Leopard Reef for the many leopard sharks that live here. They sometimes come up so shallow that they can be seen from the boat. Approach slowly from an angle where the shark can see you, never from behind or from above.
Mantas, whitetip reef sharks, giant and bluefin trevally, barracuda, napoleon wrasse, fusiliers and batfish also turn up.
Marine life here
Confirmed by our research team, reported by independent divers, or observed nearby via iNaturalist — each entry is labelled with its source.
TrevallyTrevallyReported here · unconfirmed
BarracudaBarracudaReported here · unconfirmed
Napoleon (humphead) wrasseNapoleon (humphead) wrasseReported here · unconfirmed
Reef sharkReef sharkReported here · unconfirmed
AngelfishAngelfishReported here · unconfirmed
Leopard / zebra sharkLeopard / zebra sharkReported here · unconfirmed
Manta rayManta rayReported here · unconfirmed
FusilierFusilierReported here · unconfirmed
BatfishBatfishReported here · unconfirmed
SweetlipsSweetlipsReported here · unconfirmed
Ornate ghost pipefishOrnate ghost pipefishReported here · unconfirmed
Granulated Sea StarChoriaster granulatusReported here · unconfirmed
Giant MorayGymnothorax javanicusReported here · unconfirmed
Longfin BatfishPlatax teiraReported here · unconfirmed
Painted Spiny LobsterPanulirus versicolorReported here · unconfirmed
Bluefin TrevallyCaranx melampygusReported here · unconfirmed
Titan TriggerfishBalistoides viridescensReported here · unconfirmed
Ocellaris AnemonefishAmphiprion ocellarisReported here · unconfirmed
Red-tailed ButterflyfishChaetodon collareReported here · unconfirmed
Whale SharkRhincodon typusReported 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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