Koh Tachai

Often regarded as one of the most thrilling dive sites in the Similan Islands region, Koh Tachai Pinnacle (also known as Koh Tachai Dome) is a must-visit for anyone embarking on a Thailand liveaboard diving trip. Known for its powerful currents, dynamic underwater scenery, and incredible marine encounters, Koh Tachai offers a high-adrenaline experience for divers seeking the best that Thailand's Andaman Sea has to offer.

The site features a submerged granite pinnacle, adorned with soft corals, sea fans, and sponges. Massive boulders are scattered across the seafloor, creating a maze of swim-throughs and hiding spots for a wide array of marine species. With good visibility and strategic positioning, this site is ideal for wide-angle photography and capturing action-packed footage of fast-moving schools.

Marine life at Koh Tachai is spectacular. Divers can expect to see schools of barracuda, giant trevally, batfish, and the occasional tiger or leopard shark patrolling the reef. Macro lovers can also spot nudibranchs, ornate ghost pipefish, and shrimp gobies tucked into the crevices. The highlight, however, is the frequent appearance of oceanic manta rays, especially from November through April—a true bucket-list moment for liveaboard divers in Thailand.

Currents here can be strong, making Koh Tachai more suitable for intermediate to advanced divers, but with DiveRACE liveaboard’s experienced guides, even newer divers can safely enjoy this site with the right planning and support. Our team ensures you’re in the water at the best times, maximizing your chances of experiencing the full magic of Koh Tachai.

Whether you're drawn to the thrill of pelagic encounters, the dramatic underwater terrain, or simply want to explore one of the most vibrant dive sites in the region, Koh Tachai delivers an unforgettable chapter in your Thailand liveaboard diving journey.

Ready to experience Koh Tachai with DiveRACE? Book your Thailand liveaboard diving adventure today and dive deeper into the heart of the Andaman Sea.

Learn more about Koh Tachai dive sites with our Dive With Us series: Koh Tachai Pinnacle and Koh Tachai Reef.