similan-islands.com · Tourism
Park/tourism page for Koh Tachai marine-life context and seasonal open window.
Koh Tachai, Ao Yai rocky pinnacle with big fish.
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Remote park-site logistics and current-sensitive timing make a local operator the practical choice.
Koh Tachai, Ao Yai is a boat-only rocky pinnacle in the Similan route with boulders, crevices, gorgonians, and fan corals. The site is known for dense schools of barracuda and batfish, plus regular manta-ray and whale-shark chances when conditions line up. It suits divers who want a current-sensitive open-water reef with clear water and strong big-fish potential.
Conservative baseline from public research. No community dives logged yet.
Depth range, seasonality, and planning context.
Reported Depth
12m - 40m
Depth Note
Main pinnacle starts around 12 m and slopes into deeper water toward 40 m.
Best Season
November to April, with the clearer late-winter to spring window often best for big-fish odds.
Typical Conditions
Open-water pinnacle diving with good visibility, changing current, and a structure-heavy profile.
Hazards, restrictions, and access requirements.
Safety Notes
Stay close to the guide and treat the site as current-sensitive even when the surface looks calm.
Access Restrictions
Seasonal park operations and boat logistics apply; confirm operator status before booking.
Community notes to help plan your visit.
Scuba Diving
Best for divers comfortable with boat entries, variable current, and following a guide on a moving profile.
Snorkeling
Not a primary snorkel site; the current-sensitive boat profile makes it better suited to scuba.
Use the planner to scan this week, inspect today in local time, and understand how exposure shapes conditions at Koh Tachai, Ao Yai.
Directional shelter context for incoming swell.
Species commonly reported at this site, with direct links into their wildlife guides.
Community dive logs and visit reports for this site.
No Dive Logs Yet
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Average conditions based on logged dives & visits.
Planning answers for access, conditions, timing, and site logistics.
Last Updated
Research Sources
Park/tourism page for Koh Tachai marine-life context and seasonal open window.
Boat-daytrip operator page for Koh Tachai current, structure, and fish-school context.
Independent guide for visibility and current baseline.
Know this site? Improve Spot Details.
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