Thailandās beauty doesnāt stop at its shores. Beneath the turquoise surface lies a whole other worldāone filled with vibrant coral reefs, curious sea creatures, and dive sites that rank among the best in the world. Whether youāre a seasoned diver chasing manta rays or a casual snorkeler just hoping to swim alongside a parrotfish or two, Thailand delivers.
Hereās a look at some of the top spots across the country to get your fins wet.
𤿠Top Dive Sites in Thailand
Richelieu Rock (Andaman Sea)
A bucket-list site for many divers, Richelieu Rock is often described as a coral cathedral. It's part of a protected marine park and is especially popular between February and April, when whale sharks occasionally glide by. The purple soft corals alone are worth the dive.Similan Islands (Phang Nga Province)
These islands are known for their pristine waters, massive underwater boulders, and vibrant marine ecosystems. Expect to see manta rays, sea turtles, and schools of tropical fish drifting through crystal-clear channels. The Similans are open to visitors from October to May.Koh Tao (Gulf of Thailand)
Koh Tao is one of the most affordable and beginner-friendly places in the world to learn how to dive. The island is dotted with dive schools and offers easy access to calm, shallow sitesāperfect for certification courses or casual dives. Plus, you might spot reef sharks on a good day.Hin Daeng & Hin Muang (Southern Andaman)
These twin pinnacles are for more experienced divers. Expect stronger currentsābut the payoff includes deep walls, vibrant soft corals, and occasional sightings of whale sharks and barracuda. It's remote and a bit more technical, but incredibly rewarding.
š Best Snorkeling Spots in Thailand
Koh Lipe (Satun Province)
Often dubbed the āMaldives of Thailand,ā Koh Lipe offers fantastic snorkeling straight from the beach. Shallow reefs, clear water, and colorful fish make it ideal for beginners, while the nearby marine park offers even more for explorers.Koh Kradan (Trang Province)
Quiet and less developed than some neighboring islands, Koh Kradanās calm, shallow waters are perfect for a relaxed snorkel session. Youāll find coral gardens just offshore and a laid-back atmosphere thatās hard to beat.Ao Sane Beach (Phuket)
Tucked away on Phuketās southwest coast, Ao Sane is a lesser-known spot with a rocky reef that shelters lots of marine life. Itās ideal for a low-key day of snorkeling without the crowds of the more tourist-heavy beaches.Surin Islands (Phang Nga Province)
If you're after healthy coral and rich biodiversity, the Surin Islands are hard to beat. Known for their ecological preservation, the waters here are crystal-clear and full of lifeāfrom clownfish to giant clams.
š Final Thoughts
From shallow coral gardens to dramatic drop-offs in the open sea, Thailand offers something for every underwater explorer. The marine life is rich, the waters are warm, and the scenery above and below the surface is nothing short of stunning.
Whether you're strapping on a tank or just a mask and snorkel, Thailandās underwater world is well worth the plunge.