Diving in Thailand: 73 Sites from Whale Sharks to Shallow Reefs

Thailand has 73 published dive sites spread across the Gulf of Thailand and the Andaman Sea, covering everything from knee-deep beginner reefs to advanced open-water pinnacles that plunge past 50 m. Water stays between 26°C and 30°C year-round, so there's no bad season to book a trip — only tradeoffs between coasts depending on monsoon patterns. Whether you're doing your first ocean dive or chasing pelagics, the range here is genuine.

Best dive sites in Thailand

• Hin Daeng / Hin Muang — Advanced, 12–50 m, visibility around 12–15 m. These twin pinnacles in the Andaman Sea are Thailand's best-known pelagic sites. Whale sharks and manta rays pass through regularly, and the walls are dense with soft coral.
• Hin Muang — Advanced, visibility 15 m. Often dived alongside Hin Daeng; the deeper sections reward divers comfortable managing depth and current.
• Sail Rock (Hin Bai) — Intermediate, 5–40 m. A seamount in the Gulf of Thailand with a vertical chimney you can swim through. Whale sharks are spotted here more reliably than almost anywhere else in the Gulf.
• Anemone Reef (Phuket) — Intermediate, 5–24 m. A submerged pinnacle covered in anemones and their resident clownfish, with regular sightings of leopard sharks resting on the sandy bottom.
• Chumpon Pinnacle — Intermediate, to 20 m. A productive site in the Gulf known for schooling fish and the occasional whale shark during the right season.
• The Elephants / Big Blue / Suthep Bay — Beginner sites with gentle conditions, suitable for open-water students and newly certified divers building confidence.
• Ko Dok Mai — A limestone karst rising from the Andaman, with swim-throughs and walls that work for intermediate divers and hold nudibranchs and moray eels.

When is the best time to dive in Thailand?

Thailand is diveable year-round, but the two coasts run on opposite monsoon schedules. The Andaman Sea (Phuket, Hin Daeng, Hin Muang) is calmest November through April. The Gulf of Thailand (Koh Tao, Sail Rock, Chumpon Pinnacle) runs best May through October. Water temperature holds at 26–30°C on both sides regardless of season.

Is Thailand good for beginner divers?

Yes. Sites like The Elephants, Big Blue, and Suthep Bay are specifically suited to beginners, with calm conditions and shallow depths. Koh Tao in particular has built an entire industry around entry-level certification courses, with dozens of schools and easy-access sites.

What you'll see

Thailand's recorded marine life includes whale sharks — seen at Sail Rock, Chumpon Pinnacle, and Hin Daeng — and blacktip reef sharks, which are common on shallower reef systems. Anemone Reef delivers reliable clownfish and resting leopard sharks. Pinnacle sites in the Andaman attract large pelagic schools.

FAQ

Do I need advanced certification for Hin Daeng and Hin Muang? Yes. Both sites are rated advanced due to depth (to 50 m) and potential current. An Advanced Open Water certification and some logged dives are expected by most operators.

Can I see whale sharks in Thailand? Yes. Whale sharks are recorded at multiple sites including Sail Rock and Hin Daeng. Sightings are more likely February through April on the Andaman side and around Koh Tao during the Gulf season.

What is the visibility like? It varies by site. Hin Muang reaches 15 m, Sail Rock ranges from 5–40 m depending on conditions, and some sites can drop lower after rain or during monsoon transitions.

Is Thailand expensive for diving? Fun dives and liveaboard trips vary widely by region. Koh Tao is among the cheapest places in the world to get certified. Liveaboards to the southern Andaman sites cost more but cover remote pinnacles unreachable by day trips.

Thailand dive map