Koh Tachai Similan National Park
Remote Similan plateau with coral, current, and big-fish action.
Local operator required
Liveaboard or park-run operator logistics are the normal way to reach the site.
About Koh Tachai Similan National Park
Koh Tachai is a remote Similan-area plateau dive built around granite boulders, coral gardens, and open-water current. The main route breaks into channels and ledges that reward controlled drifts when the water is moving, while the quieter pockets let you work the reef and sand patches. Divers come here for big schools of barracuda, trevally, and fusiliers, plus manta, whale shark, turtle, and ray chances when conditions line up.
Research Estimate At Koh Tachai Similan National Park
Conservative baseline from public research. No community dives logged yet.
Where Is Koh Tachai Similan National Park?
Koh Tachai Similan National Park Planning Details
Depth range, seasonality, and planning context.
Reported Depth
12m - 40m
Depth Note
Main plateau starts shallow at around 12m and slopes across boulders toward deeper water, with operators working the upper-to-mid section on many dives.
Best Season
Late October to early May.
Typical Conditions
Open-water plateau with clear water, current-driven drifts, and big-fish sightings when flow lines up.
Safety & Access At Koh Tachai Similan National Park
Hazards, restrictions, and access requirements.
Key Hazards
Safety Notes
Treat it as a current-aware dive and stay honest about the day’s flow, especially on the descent line and turn.
Access Restrictions
Boat access only.
Legal Notes
Ko Tachai island is closed to general public access; dive visits depend on park-controlled access and seasonal openings.
Local Intel For Koh Tachai Similan National Park
Community notes to help plan your visit.
Scuba Diving
Submerged plateau with boulder fields, coral gardens, channels, and a secondary deeper pinnacle when conditions allow.
Koh Tachai Similan National Park Dive Conditions Planner
Use the planner to scan this week, inspect today in local time, and understand how exposure shapes conditions at Koh Tachai Similan National Park.
Exposure Profile at Koh Tachai Similan National Park
Directional shelter context for incoming swell.
Wildlife at Koh Tachai Similan National Park
Species commonly reported at this site, with direct links into their wildlife guides.
Recent Logged Visits At Koh Tachai Similan National Park
Community dive logs and visit reports for this site.
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Dive Spot Log Averages At Koh Tachai Similan National Park
Average conditions based on logged dives & visits.
Koh Tachai Similan National Park Guide - Frequently Asked Questions
Planning answers for access, conditions, timing, and site logistics.
Koh Tachai Similan National Park Guide - Sources and Updates
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