Scuba Thailand - Dive Sites
Koh Tachai
Koh Tachai (Tachai Island) lies about halfway between the Surin and Similan Islands and is rated as one of the best sites for Thailand scuba liveaboards as it's normally visited on the way to Richelieu Rock from the Similans.
There are several dive sites around the island but the most famous is Koh Tachai Plateau which lies southeast of the island, about one kilometre offshore. The plateau is a submerged crowned reef of hard sheet corals, and scattered boulders. These boulders provide great swim-throughs and cut-through opportunities. They also provide refuge for tired scuba divers caught unawares by the sometimes hectic currents!
This site is renowned for its currents and a dive briefing on any Thailand liveaboard scuba trip will include advice on where to find shelter. A dive here is not for beginners and not always easy but it is worthwhile because, as any diver knows, where there are currents there are big fish. Chief among these are manta rays who make regular appearances and effortlessly glide over the boulders.
Other big visitors are whale sharks and nurse sharks. Leopard sharks are common and hawksbill turtles are often seen. Other common fish you'll see here are blue-dash and yellow-backed fusiliers, red-tooth triggerfish, bigeye trevally and unicornfish.
The south side of Koh Tachai is the deeper side, and a logical place to start your dive. The north side features a huge abandoned fish cage which is useful as a navigational aid. At the edge of the coral crown is a cleaning station, popular with tiera batfish which always makes for a pleasant safety stop as you hang on the line at the end of the dive. Koh Tachai is often dived early morning by liveaboard but also makes a nice sunset dive.
• Map of Similans and Surin Island
Koh Tachai Reef Basics:
Great for: Large animals, reef life and health, dive value-for-money and advanced divers
Not so Great for: Wrecks, wall dives, beginner divers, snorkelling and non-diving activities
Depth: 14 - 36m
Visibility: 15 - 40m
Currents: Can be very strong
Surface Conditions: Can be rough
Water Temperature: 26 - 29°C
Experience Level: Intermediate - advanced
Number of dive sites: 4
Diving Season: November to April
Distance: ~165 km north of Phuket (9 hours), 65 km northwest of Khao Lak (3½ hours, or 1¾ hours by speed boat)
Access: Scuba Thailand liveaboards and Khao Lak diving day trips
Recommended length of stay: 1 day
Other nearby sites that can be dived on liveaboard cruises and day trips, together with Koh Tachai:
Other nearby sites that can only be dived on extended Koh Tachai liveaboard cruises:
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