Koh Tachai Pinnacle/The Dome

The Dome is a hidden reef point located about 500m south of Tachai Island. A large dome-shaped bedrock shaped like an upturned plate is dotted around a large granite boulder. The top of is at 12 meters and the current can be the strongest in the area depending on the conditions. As a result, there are many large predatory fish such as blue and white trevally, bluefin tuna, barracudas, manta rays, and whale bays.

The middle layer is filled with a variety of yellowbacks, yellow dashes, blue dashes, and other fusiliers. At dawn and dusk you can see them being attacked by bluefin trevelly and a tornado of 1,000 blackfin barracuda. Manta rays and whale sharks are seen.

Level

Level

  • Advanced
Visibility

Visibility

  • 17 m
Current

Current

  • Light Current
  • No Current
  • Strong Current
  • Ripping Current
DIVE TYPES

DIVE TYPES

  • Drift Dive
  • Cleaning Station
  • Pinnacle, Needle, Seamount

Temperature & Visibility

Dives

Wildlife Diversity

Affiliated Training Center

Recommended Training

Boat Diving

Discover pristine dive sites that cannot be reached from shore and experience the excitement of liveaboard diving. Learn all you need to dive from boats with the SSI Boat Diving Specialty. Start today!

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Stress & Rescue

Learn to identify stress, prevent accidents, and learn rescue diver skills with this essential Diver Stress and Rescue Specialty program. Help yourself and other divers to stay safe. Get started now!

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Enriched Air Nitrox Level 2 (40%)

Extend your dive time, shorten your surface intervals and spend more time exploring the dive sites you love, with the SSI Enriched Air Nitrox Specialty certification program.

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Night Diving and Limited Visibility

Diving does not end when the sun goes down! Become a night diver and meet the incredible marine life that only comes out at night. Join the SSI Night Diving and Limited Visibility specialty program.

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Navigation

Become a better, more confident diver who always knows where they are going. Learn how to use a dive compass, natural navigation techniques and more. Join the SSI Navigation specialty today!

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Waves, Tides & Currents

Take control of your dives no matter the conditions with the SSI Waves, Tides and Currents specialty. Learn all you need to go diving in currents, waves and rivers, enjoy shore diving and learn about the environmental conditions that affect dive sites.

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Deep Diving

Many exciting and iconic dive sites lie in deeper waters. The SSI Deep Diving Specialty will get you there - safely and with confidence. Learn how to plan and conduct dives to between 18 and 40 meters deep with SSI.

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Scooter / DPV

Enjoy longer dives, explore further and cover a larger area on every dive. Become an SSI Scooter/DPV Specialty Diver. Get started today.

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Perfect Buoyancy

The SSI Perfect Buoyancy Specialty is the best way to improve your body position for relaxed dives, lower your air consumption and increase your bottom times. Take control of your enjoyment. Start online now!

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Photo & Video

Learn how to take underwater photos that capture your dive highlights and incredible marine life encounters with the SSI Photo & Video Specialty program. Get started online today.

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Shark Ecology

Sharks are vital for healthy oceans and are truly spectacular to dive with! Join the SSI Shark Ecology program and learn how to dive safely with sharks, why their behaviors are misunderstood and more. Start online today!

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Marine Ecology

The SSI Marine Ecology Specialty program is the best way to discover the exciting science of marine ecology and become an underwater naturalist. Enhance your dives in a new way. Earn the SSI Marine Ecology specialty certification now!

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Manta And Ray Ecology

Diving with mantas and other rays is one of the best dive experiences you will have. Learn how to safely interact with rays and recognize different species with the SSI Manta & Ray Ecology Specialty program.

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Fish Identification

Learn how to identify fish with the SSI Fish Identification specialty program and enhance your dives! Discover all you need to identify common families of Caribbean, Indo-Pacific and Red Sea reef fish and earn your SSI Fish Identification specialty certification.

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Dive sites nearby

The Tachai Pinnacle is a rocky dive site with lots of boulders, but between each crevice there are lots of gorgonians and powerful fan corals in all colors.

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Ao Lek, Koh Tachai

An easy dive site with many big rocks. In between, there are always coral blocks. This is a long dive site that is good for a drift dive.

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Koh Bon Pinnacle

Not for beginners! Koh Bon Pinnacle starts at 22m and ends at 45m or deeper. Beautiful vegetation with lots of yellow soft corals are here. There are no descent ropes available. Doing a negative entry is an advantage!

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Nice shallow area for diving with a slightly sloping reef. You can swim from the North Ridge over the West Ridge and into the bay. Currents are usually weak to moderate.

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Bon Island, about 50 km west of Khao Lak, is an uplifted limestone island about 20 km north of the Similan Islands. This is a long and narrow ridge point on the west side of the island.

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The Wall/Waterfall, Koh Bon

This dive site is actually between Koh Bon Bay and West Ridge. A good place to jump from the boat into the water, as you can dive without currents. Viewing the waterfall from below is a natural spectacle in itself.

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Bon Island, about 50 km west of Khao Lak, is an uplifted limestone island about 20 km north of the Similan Islands. This is a long and narrow ridge point on the west side of the island.

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Simple and colorful reef, good for beginners and snorkelers. Slightly sloping reef with many coral blocks and a few sand areas.

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Richelieu Rock is one of the most popular dive sites in Surin Islands National Park. It is a limestone reef that rises almost vertically from a depth of 35 meters, and appears only at low tide, about 1 meter above the surface.

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This point is located northeast of the 9th island in the Similan Islands. It is named after the three large trees that are used to mark the entry, from a shallow depth of about 5 meters to a reef slope of about 18 meters, beyond which there is a pure white sandy area dotted with isolated roots. Offshore, there are beautiful rocky areas with schools of soft corals, where you can see large fish. Because the tide splits on the island, the tide is clear and you can enjoy drift dives when the tide is strong.

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