If you love adventure and marine life, diving in Thailand is an experience not to be missed. Whether you’re planning Thailand holidays or a more focused escape to the islands, Thailand’s waters are full of colourful coral reefs, tropical fish and even larger species like manta rays and whale sharks.
Planning a trip to the Phi Phi islands or a stay in Phuket? This guide will help you discover the best diving spots in Thailand for 2026.
Is Thailand Good for Diving?
Thailand is world-renowned for its diving opportunities. Warm waters, excellent visibility and diverse marine ecosystems make it one of the best places to dive in Southeast Asia.
The Andaman Sea on the west coast and the Gulf of Thailand on the east coast both offer fantastic dive sites. If you’re looking for other ways to enjoy Thailand above water, don’t miss our guide on things to do in Thailand or check out the best beaches in Thailand for relaxing between dives.
Best Diving in Thailand
1. Similan Islands
Located off the coast of Phuket, the Similan Islands are a diver’s dream. Clear waters, vibrant coral reefs and dramatic rock formations make it one of the most celebrated spots for Thailand diving. Expect to encounter manta rays, whale sharks and a variety of tropical fish.
2. Koh Tao
Koh Tao is a small island in the Gulf of Thailand known for its beginner-friendly dive sites. Gentle currents and shallow coral gardens make it ideal for those new to diving or pursuing certification courses. Night dives here reveal fascinating nocturnal marine life.
3. Phi Phi Islands
A trip to the Phi Phi islands isn't complete without a dive. Popular sites include Shark Point and Bida Nok. Expect to see blacktip reef sharks, turtles and an array of colourful reef fish. The underwater topography with pinnacles and caves, adds excitement for more experienced divers.
Richelieu Rock
Richelieu Rock is considered one of the best diving spots in Thailand for advanced divers. This offshore pinnacle is famous for encounters with whale sharks, manta rays and large schools of fish. Vibrant soft corals create an unforgettable underwater landscape.
Koh Phi Phi Leh
Famous for its limestone cliffs and clear waters, Koh Phi Phi Leh offers dives suitable for intermediate and advanced divers. Look out for schools of barracuda, groupers and stunning coral formations along dramatic walls and swim-throughs.
Koh Lanta
Koh Lanta has several dive sites ideal for all levels. Hin Daeng and Hin Muang are top picks, offering deep walls, overhangs and frequent sightings of manta rays. The underwater scenery here is truly spectacular.
Koh Haa
Koh Haa is a cluster of limestone islands with hidden lagoons and underwater caves. Divers can enjoy colourful reefs, abundant marine life and crystal-clear waters, perfect for underwater photography.
Ao Nang
Located near Krabi, Ao Nang offers easy access to some excellent diving spots. Gentle currents and diverse coral formations make it a good choice for beginner to intermediate divers. Expect to see parrotfish, lionfish and occasionally turtles.
Koh Phi Phi Don
Dive sites around Koh Phi Phi Don provide a variety of experiences from coral gardens to deep wall dives. Spot schools of jackfish, moray eels and occasionally leopard sharks. The underwater caves and swim-throughs are particularly appealing.
Surin Islands
The Surin Islands are more remote, offering pristine reefs and fewer crowds. Expect incredible biodiversity including reef sharks, colourful nudibranchs and large schools of tropical fish. This area is a true hidden gem for best diving in Thailand.
Planning Your Diving Trip to Thailand
When planning Thailand diving trips, consider your skill level, the time of year and which islands you want to explore. Combining a dive adventure with some downtime on Phuket or a trip to the Phi Phi islands ensures a well-rounded holiday.
Thailand’s waters are diverse, vibrant and ready to be explored. Whether you’re a beginner or an experienced diver, these are the best places to dive in Thailand in 2026.
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