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Thailand, one of the world’s top tourists’ destinations, receiving over a million people per year. It goes without saying that a lot of people flock here due to its ridiculously stunning beaches. Located in the heart of South Asia, it offers miles of tropical beaches, exhilarating cultural experiences and fantastic marine and reef life for underwater enthusiasts.

These places vary from wild current swept rocky landscapes to gentle sloping coral reef.  To help you plan your next underwater holiday, here are a few of the best scuba diving sites in Thailand waiting to be explored!Group of divers preparing to dive of a boat, Thailand

Best Diving in Thailand

To quickly answer your questions, here’s our list of the top dive sites all over Thailand and the various locations for each one. In this article, I will give information on each location and go into specifics on what you can see in each destination.

  • Hin Daeng and Hin Muang, Koh Lanta
  • Koh Dok Mai, Phuket
  • Richelieu Rock, Koh Tachai, and Koh Bon, near Similan Islands
  • Similan Islands
  • Chumphon Pinnacle, Koh Tao
  • HTMS Sattakut Wreck
  • Sail Rock, Koh Tao (Also near Koh Samui and Koh Phangan)

Best Time to Scuba Dive in Thailand

Thailand is in a tropical region and therefore one can go diving anytime, all year round. However, the best conditions exist between November and April as Sharks visit from February to May. With bathtub like temperatures of 28-31 degrees, your diving conditions could not be better.

If you want to be a bit more specific, if you are visiting dive sites in the Andaman Sea, it is best to come from October to April. You have the Giant Manta Rays which arrive at the Similan Islands in March or April.

During the months of May, expect heavy rainfall which is why a lot of the marine reserves are closed (until mid-October). During those times, diving in places along the Gulf of Thailand is a lot more recommended.

Best Dive Sites and Locations in Thailand

Dive Site: Hin Daeng and Hin Muang

Location: 50km off of Ko Lanta (2 hours by boat or 1 hour 20 minutes from Koh Phi Phi)

To start things off, I’ll begin with my personal favorite, Hin-Daeng and Hin-Muang also known as the red and purple rock. If you’re a ‘life-below-water’ fan, this is your best shot to see gray sharks and manta rays.

However, that’s not all you get as at the red and purple rock; you get an exciting experience of diving Thailand’s biggest vertical wall, next to caverns and caves that add a thrill to the adventure. These dive sites are feeding grounds for pelagic fish, allowing you to see lots of large creatures during your dive. The currents in these areas can be quite strong so experienced divers are recommended.

Highlights: Large pelagics, cave dive, Grey Reef, and Leopard Shark sightings, and if you’re lucky, you can also spot a whale shark which occasionally hangs around this spot.

Leopard Shark and Soft Corals at Hin Daeng Dive Spot, Thailand

Dive Site: Koh Dok Mai

Location: In the middle of Phuket and Koh Phi Phi (about 90 minutes by boat from Phuket)

Another great dive is the Koh Dok Mai, a superb wall and drift dive with crevices lurking, hidden caves and limestone rock face. If you want to have an electric experience, this is the place to go. When you’re diving, keep an eye out or you might miss an eel peeking out of the yellow tube corals.

The best time to dive at this specific place is around midday as the sun provides an illuminating effect, giving you the perfect glimpse of baby sharks nursing, depending on the season.

There are three sides of walls making up this large limestone rock, boasting of different creatures which can be found in every nook and cranny. Because of its interesting formation, this can also be done as a night dive.

A small cave (about 5 m straight in) leads to a huge cavern with fairly strong currents adding to the whole thrill and excitement of this dive spot.

Highlights: Several species of moray eels, large soft corals, sea horse, and leopard sharks which often lurk around.

Diving in Phi Phi and Phuket Island: If you want to try scuba diving in these locations, here are some of our recommended tours and dive companies. Discover Dive in Koh Phi Phi and PADI Open Water Course in Phuket.

Leopard Moray Eel at Koh Dok Mai Dive Spot, Thailand

Dive Site: Richelieu Rock, Koh Tachai, and Koh Bon

Location: Located between Similan and Surin Islands (only accessible by liveaboard)

Richelieu Rock is a horseshoe-shaped rock in the Andaman Sea and is one of the best dive sites in Thailand. If you are out to look for barracuda tornadoes and schools of tropical fish, this is the place to be.

Be sure to spot seahorses, pipefish, cuttlefish and even shovelnose rays while you are there. The huge center pinnacle surrounded by small rocks are covered by soft corals, anemones, sponges and large sea fans. It is truly a sight to see!

Although there are lots of dive sites in Thailand where you can see whale sharks, the nutrient-rich waters contain loads of planktons which attracts whale sharks all the time. This dive site is HUGE attracting a lot of large and small creatures waiting to be discovered. The currents in these dive sites can be a bit strong so again, only advanced or experienced divers are recommended to give it a try.

Similarly, Koh Tachai and Koh Bon are sites which are part of the Similan Island National Park. It is well known for being one of the best dive sites in Thailand where you can spot mantas. Apart from this, you can also often find black tips reef sharks and eagle rays.

Koh Tachai is also known for its epic swim throughs and channels which you can drift around in. Together, these islands in the North of Similan are known as the best scuba diving in Thailand. Altogether, they boast of large pelagics like barracudas, trevally, and tuna.

Highlights: Possibility of seeing whale sharks, manta rays, and eagle rays.Whale shark, Richelieu Rock Dive Spot, Thailand

Dive Site: The Similan Islands

Location: Similan National Marine Park (Mostly explored on liveaboards)

Located within the premises of the National Park, the Similan Islands offers one of the best diving sites in the entire of Thailand. Within the area, there are about 20 different dive sites which you can explore, all boasting of a wide variety of creatures.

Elephant head or (Hin Pusar) is known to be one of their best dive sites within the area due to its intricate maze-like rocks composed of swim throughs, channels and gorges reaching depths of over 40m. It is really something else and is pretty out of this world! Other notable sites within the area are Christmas Point and Fantasea Reef.

Highlights: The untouched waters, the wide variety of corals and fish, leopard sharks, turtles, and the challenging maze-like swim throughs and currents.

If you want to experience liveaboard diving, click the button below to read our full Similan Liveaboard comparison guide which has details on the best boats, when to go, and more.

Click Here to View Similan LIveaboard Comparison
Fish and coral at the Similan Islands, Thailand

Dive Site: Chumphon Pinnacle

Location: Koh Tao

If you’re looking for great diving along the Gulf of Thailand, Koh Tao is probably your best bet. Popular amongst people doing PADI certification lessons, no dive is complete in Koh Tao without visiting the Chumphon pinnacle.

The entire top bit of the pinnacle is full of anemone, making it home to loads of fish, white moral eels, crabs, and shrimps.

The deeper you go, you get to see more holes as you descend down this wall. Along the way, you will see juvenile barracudas, trevallies, bannerfish and a lot more. Whale sharks sometimes come for a visit, depending on the season. Other types of sharks used to frequent this area but they aren’t so common anymore.

Highlights: Large schools of fish, colorful reef, and marine life.

Getting PADI Certified in Koh Tao: For us, if you’re interested in scuba diving, Koh Tao, Thailand is one of the best places to do it due to the calm waters and the stunning dive sites. If you’re not certified yet, consider getting certified in Koh Tao. as it is also one of the cheapest places in the world! Alternatively, you can also check out these fun adventure dives to Sail Rock.

Diver and coral reef, Thailand

Dive Site: HTMS Sattakut Wreck

Location: Off of Koh Tao

For history lovers and students, we have not forgotten you. HTMS Sattakut is one of Thailand’s premier wrecks which was sunk on 18th June 2011 near Koh Tao. Furthermore, the landing craft infantry, also known as (LCI) was one of the infamous assault ships during world war two.

This artificial reef harbors both of the two historical vessels which has turned into a home for various types of marine life. Additionally, it is the home to barracudas, groupers, schools of Fusiliers, blennies and moray eels. For those of you who haven’t done any type of wreck dive, this is a good point to start and is definitely something that is out of the ordinary.

Highlights: Aside from the wreck itself, Grey Reef Shark, Great Barracudas, Pufferfish and various Flatworms.

Lion fish and shipwreck at the HTMS Sattakut Wreck Dive Site, Thailand

Dive Site: Sail Rock

Location: North of Koh Samui, in between Koh Pha Ngan and Koh Tao

Hin Bai or Sail Rock is one of Thailand’s best wall dives. Lots of schools offer trips here which is something we highly recommend doing as diving is just fantastic. People flock to Sail Rock as its vertical chimney is a fun ascend. The entire site is large enough to be explored by both students and more advanced divers as it plunges to around 40 meters.

Highlights: Large schools of Yellow Fusiliers, Trevally, Giant Morays, Large Groupers, Batfish, and if you’re lucky, Whale Sharks.

A school of blacktail barracudas at Chumphon Pinnacle Dive Spot, Thailand

Types of Diving in Thailand

Diving in Thailand is a treat due to its tropical waters. It is home to over Source2125 different species of fish and has some of the best reef dives in Southeast Asia. A lot of people opt to learn scuba diving in Thailand due to its reasonable rates as well as its calm and clear waters.

Reef Diving

Reef diving in Thailand is nothing short of beautiful! The reefs here are abundant and well preserved, making it a hotspot for dive enthusiasts around the world. Although diving in Thailand is known for large fish and pelagics, there are also a few areas where you can enjoy macro diving.

Wreck Diving

If you enjoy wreck diving, you might want to consider heading to Pattaya, a place which is loosely labelled as the “wreck diving capital of Thailand” Pattaya is home to five wrecks, namely the HTMS Kut, HTMS Khram and HTMS Mataphon which are all World War II-era ships from the US Navy that were decommissioned and given to the Thai Navy.

The navy, later on, sank these ships to serve as artificial reefs. You can also see the S.S Suddhadib and the Bremen Wreck no more than 1hr down the coast from Pattaya.

Located not too far from Pattaya is an island called Koh Chang which is home to the largest shipwreck dive spot in all of Thailand! The HTMS Chang is 100m in length and can be explored thoroughly!

Liveaboard Diving in Thailand

Liveaboard diving is insanely popular in Thailand and is a great way to make the most of the best dive sites in Thailand. Most of the liveaboard in Thailand are usually 5 days and 4 nights, sailing to some of the most beautiful waters in the country.

While the itinerary varies, most of the boats take you to the Similan Islands where you can enjoy dives in secluded locations. We’ve done a few liveaboards in Southeast Asia and have to say that they are one of the best ways to really make the most out of your diving trip!

If you want to see all the liveaboard boats available in Thailand, click the button below.

Click Here to View Boats

Video of Scuba Diving in Thailand

Scuba Diving Safety in Thailand

Generally speaking, scuba diving in Thailand is extremely safe as there are plenty of easy beginner dives. While some dives have currents, the dive masters you are diving with should be able to give you a full breakdown on how technical each dive is.

As always, make sure you have diving insurance before you go underwater. We recommend World Nomads as they have fantastic coverage for activities like this.

There you have it! Hopefully, this article has given you a great overview of all the best scuba diving in Thailand and has encouraged you to explore the underwater marine life in this country.


Planning on Traveling Around the Thai Islands? Check out a few of our guides:

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