Dive Spot Guide•
Koh Tachai Similan National Park
Remote Similan plateau with coral, current, and big-fish action.
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Local operator required
Liveaboard or park-run operator logistics are the normal way to reach the site.
Seasonal park access and liveaboard logistics keep the site remote, while open water and moving current make it better for confident divers.
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.
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Research Estimate At Koh Tachai Similan National Park
Conservative baseline from public research. No community dives logged yet.
VisibilityVisibility: 20m
AccessChallenging entry effort
CoralHealthy coral
Aquatic LifeExceptional variety
FacilitiesLimited facilities
Crowd / PopularityModerate
CurrentStrong current
Where Is Koh Tachai Similan National Park?
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Community sourced coordinates.
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
Strong currentWaves
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.
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.
Dive Spot Log Averages At Koh Tachai Similan National Park
Average conditions based on logged dives & visits.
Conditions
Avg. Visibility20m
Activity
No dive activity logged yet.
