Koh Tao has earned its reputation as one of the world's most popular places to learn to dive. Its warm, clear Gulf of Thailand waters, affordable dive courses, and spectacular marine life draw over 100,000 divers a year.

🤿 Best Dive Sites

Chumphon Pinnacle

One of the best dives in all of Southeast Asia. A seamount rising from 40 m to 14 m, covered in hard and soft corals, with almost guaranteed sightings of whale sharks (October–January), giant grouper, and schooling bigeye jacks. Suitable for Advanced divers only.

Sail Rock (Hin Bai)

Rising 15 m above the surface between Koh Tao and Koh Phangan, Sail Rock is famous for its "chimney" — a vertical swim-through packed with fish. One of the top 10 dive sites in Thailand. Regular day trips from both islands.

HTMS Sattakut (Wreck)

A decommissioned US Navy vessel deliberately sunk in 2011 as an artificial reef. Sits at 20–30 m depth. Penetration dive for experienced divers. Encrusted in coral and home to huge moray eels, lion fish, and trevallies.

Tanote Bay

The best snorkelling and entry-level dive site on the island. Calm and shallow with boulders, brain corals, and lots of smaller reef fish. Easy beach entry.

📚 Learning to Dive on Koh Tao

• PADI Open Water: 3 days, ฿9,500–10,000. Teaches you to dive to 18 m.
• Advanced Open Water: 2 days, ฿8,000–9,000. Unlocks Chumphon Pinnacle and deeper sites.
• Rescue Diver: 2–3 days, ฿10,000. Widely considered the most useful PADI course.
• High season: courses fill up — book in advance. Low season (May–Oct): fewer crowds, better prices.

🚢 Getting to Koh Tao

From Chumphon (mainland)

• Lomprayah High Speed Catamaran: 1 hr 15 min. ฿600. Departs 07:00, 13:00.
• Night Boat (slow boat): Departs 23:00, arrives 05:00. ฿300 (deck) / ฿450 (cabin).

From Koh Samui

• Lomprayah Catamaran: 1 hr 30 min. ฿650. Via Koh Phangan.
• Seatran Discovery: 2 hrs. ฿450.

✅ Diver's Tips

• High season (Jan–April): pre-book your course and accommodation months in advance.
• Beware strong currents at some sites — always dive with a guide.
• The island has excellent equipment rental; you don't need to bring your own.
• Bring biodegradable sunscreen — reef protection matters.