1. Raja Ampat, Indonesia

Diving’s so-called “crown jewel” lives up to the hype — Raja Ampat’s 1,500-plus islands hold the highest recorded marine biodiversity on Earth. Expect manta rays, healthy reef sharks, and coral gardens that still look untouched.

Best time to dive: October to April

2. Sipadan, Malaysia

This UNESCO World Heritage site is routinely ranked among the best dives on the planet, and for good reason. Barracuda tornadoes, resident sea turtles, and hammerhead sharks all show up here regularly.

Best time to dive: April to December

3. Komodo National Park, Indonesia

Komodo built its reputation on strong drift diving over manta-filled currents and vibrant coral gardens. Batu Bolong and Castle Rock are the two sites worth planning your trip around.

Best time to dive: March to October

4. Koh Tao, Thailand

Koh Tao earned its reputation as a diver’s playground by turning out more PADI certifications than almost anywhere else in the world. Beginner-friendly dive schools are everywhere, and whale sharks make the occasional appearance.

Best time to dive: March to September

5. Malapascua, Philippines

This small island punches well above its weight thanks to Monad Shoal, one of the few places on Earth with near-guaranteed thresher shark sightings. Shark lovers, this one’s non-negotiable.

Best time to dive: December to April

6. Bali, Indonesia

Bali’s dive sites cover the full spectrum — from the sunken USS Liberty in Tulamben wreck to macro life in Amed. There’s a site here for nearly every skill level.

Best time to dive: April to November

7. Similan Islands, Thailand

Granite boulders, dramatic swim-throughs, and open-water pelagic encounters make the Similan Islands a liveaboard favorite rather than a day-trip destination.

Best time to dive: October to May

8. Tubbataha Reefs, Philippines

Reachable only by liveaboard, Tubbataha rewards the effort with pristine coral walls and regular sightings of hammerheads and whale sharks. It’s remote, and that’s exactly the point.

Best time to dive: Mid-March to mid-June

9. Mabul Island, Malaysia

Macro photographers tend to lose their minds here. Flamboyant cuttlefish, blue-ringed octopus, and nudibranchs of every color turn up on nearly every dive.

Best time to dive: Year-round

10. Nusa Penida, Indonesia

Just a short boat ride from Bali, Nusa Penida is known for strong currents and a seasonal shot at mola mola (ocean sunfish). Crystal Bay and Manta Point are highlights.

Best time to dive: July to October

Final Thoughts

From the colorful reefs of Raja Ampat to the shark dives in Sipadan, Southeast Asia rewards divers of every kind — macro hunters, wreck explorers, and adrenaline seekers alike. Any one of these ten sites is reason enough to book a trip.

Want to find more dive sites near you? Check out our Dive Site Map to explore dive schools, conditions, and reviews worldwide.

Ready to plan your trip? Browse dive sites across Southeast Asia.