Dive Site: Koh Tao — Twins

About Koh Tao — Twins

Twins, a highly popular dive site near Koh Tao, Thailand, is renowned for its accessibility and rich marine life. Situated off the southern shore of Koh Nang Yuan, it features two prominent granite pinnacles rising from a sandy seabed, connected by a vibrant hard coral saddle. The site ranges in depth from 5 to 18 meters, with most action concentrated between 5 and 14 meters, making it ideal for various skill levels, including Open Water students and beginner divers. Its sheltered location ensures generally calm conditions and mild currents, providing an excellent environment for learning and relaxed exploration. The clear waters, often with visibility up to 20 meters, offer divers consistent views of the diverse ecosystem. The topography includes granite rock formations, boulders, and extensive coral gardens with staghorn, brain, and table corals. A deeper, smaller group of rocks lies further west, adding another element to exploration. Divers can navigate along an east-west axis, exploring the pinnacles and a shallow archway (not a swim-through) on the northern side of the middle peak. The site is part of a citizen science monitoring project, tracking coral nurseries and resident marine populations, and it is also home to Buoyancy World, an artificial reef project. Marine life at Twins is abundant and varied. Divers can encounter saddleback anemonefish, gobies, yellow boxfish, and blue spotted stingrays. White-eyed moray eels and titan triggerfish are common, though triggerfish can be territorial. Patient observers might spot macro treasures like ornate ghost pipefish and painted frogfish. Larger species include yellowtail barracuda, blue-lined snapper, and occasionally blacktip reef sharks and even hawksbill turtles.

Dive site facts: Koh Tao — Twins

Depth

3–18 m

Typical dive

5–14 m, 50–60 min

Current

Mild

Visibility

15–30 m

Water temperature

27–30°C

Entry

Boat / giant stride

Level

All levels, beginner-friendly

Dive type

Reef, pinnacle, macro

Night dive

Possible

Region / port

Koh Tao, Gulf of Thailand

Coordinates

10.118, 99.828

Conditions & Currents

Currents at Twins Pinnacles are typically mild, making it an ideal site for divers of all experience levels, including beginners and Open Water students. The pinnacles provide natural shelter and orientation, simplifying navigation. Surface conditions are generally calm due to its sheltered location behind Koh Nang Yuan, though windier days can bring slight choppiness. Visibility is usually excellent, often exceeding 20 meters, but can temporarily decrease after heavy rainfall due to runoff. There are no notable thermoclines, and water temperatures remain warm year-round, ensuring comfortable diving. The mild conditions mean entry and exit procedures are usually straightforward, typically involving a giant stride from the boat.

Marine life & sighting chances

Yellowtail barracuda

common

Blue-lined snapper

common

Titan triggerfish

occasional

Blacktip reef shark

occasional

Hawksbill turtle

common

Ornate ghost pipefish

occasional

Painted frogfish

occasional

Moray eel

common

Banded coral shrimp

common

Whale shark

March–May · rare

Dive profile & how the dive runs

A typical dive at Twins Pinnacles begins with a descent along the mooring line, immediately revealing the two granite pinnacles. You'll drop to the base of the eastern pinnacle, which meets the sand at approximately 14 meters, and can explore crevices for moray eels and banded coral shrimp. Circumnavigate this pinnacle, keeping an eye out for titan triggerfish and schools of blue-lined snapper. The saddle connecting the two pinnacles, at around 7 meters, is a highlight due to its extensive hard coral coverage and frequent sightings of hawksbill turtles and yellowtail barracuda. The western pinnacle offers excellent macro opportunities, including ghost pipefish and frogfish. Your ascent typically concludes with a safety stop at 5 meters, often around the pinnacle top, where blacktip reef sharks may cruise by.

Underwater photography

Twins Pinnacles offers fantastic opportunities for both wide-angle and macro photography. For wide-angle shots, a fisheye or wide-angle lens is ideal to capture the grandeur of the granite pinnacles and the large schools of fish, such as barracuda tornados over the saddle. The vibrant hard coral gardens between the pinnacles also make for compelling wide-angle compositions. For macro enthusiasts, a dedicated macro lens or close-up filters will be essential to capture the intricate details of ornate ghost pipefish, painted frogfish, and other small critters hidden within the corals and gorgonian fans. Good buoyancy control is crucial to avoid disturbing the fragile coral and sand, especially when focusing on macro subjects. Utilize external strobes to bring out the true colors of the marine life and coral, compensating for the green cast of the Gulf of Thailand's waters.

Combine with nearby dive sites

• Koh Tao — Japanese Garden

  A shallow reef with stunning coral formations, ideal for beginners and snorkelers.

• Koh Tao — Green Rock

  Known for its swim-throughs and caverns, featuring vibrant marine life including triggerfish and moray eels.

• Chumphon Pinnacle

  A deeper site with massive granite pinnacles, attracting large pelagics like barracuda and occasional whale sharks.

• Elephant Head Rock

  A series of submerged boulders forming swim-throughs and attracting diverse reef fish.

• Sail Rock

  Located between Koh Tao and Koh Phangan, famous for its vertical rock and 'chimney' swim-through, with abundant fish schools and whale shark sightings.

Getting there & logistics

Koh Tao is accessible via high-speed catamaran or overnight ferry from mainland ports like Surat Thani or Chumphon, or from neighboring islands such as Koh Samui and Koh Phangan. The journey duration ranges from 1.5 to 6 hours depending on the departure point. Twins Pinnacles is located off the southern tip of Koh Nang Yuan, a mere ten-minute longtail boat ride from Sairee Beach on Koh Tao. Many dive operators on Koh Tao run daily trips to Twins, often combining it with other nearby sites. Most dive packages include boat transfers, dive guides, and equipment rental. There are no specific park entry fees for Twins, but general marine park fees may apply for other sites in the region. Trips typically range from single-day excursions to multi-day dive courses that utilize Twins as a primary training site.

Safety & environment

Koh Tao has several dive centers, ensuring adherence to international safety standards. The nearest recompression chamber is located in Koh Samui, necessitating an emergency evacuation by speedboat or ferry, which typically takes a few hours. Comprehensive dive insurance is highly recommended to cover potential medical emergencies and evacuation costs. At Twins Pinnacles, specific hazards include potential encounters with territorial titan triggerfish, especially during nesting season, which may require divers to maintain distance. Buoyancy control is paramount to avoid damaging the delicate coral formations, particularly in the shallower saddle area. Always dive with a reputable operator, follow your dive guide's instructions, and conduct buddy checks before each dive.

Who it suits — and who it doesn't

FAQ

Koh Tao — Twins FAQ

Liveaboards diving Koh Tao — Twins

These liveaboards may visit Koh Tao — Twins on selected itineraries — the exact dive sites depend on departure, weather and conditions.

Mandarin Queen 9

Thailand

26 guests37.5 m

Manta Queen 8

Thailand

24 guests

$127/day

The Junk

Thailand

18 guests33 m

$163/day

Deep Andaman Queen

Thailand

23 guests30.5 m

$194/day

Explorer

Thailand

16 guests25 m

$150/day

Andaman

Thailand

20 guests26 m

$108/day

Stingray

Thailand

8 guests24 m

$245/day

Seatopia

Thailand

24 guests24 m