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!
- 1 Best Diving in Thailand
- 2 Best Time to Scuba Dive in Thailand
- 3 Best Dive Sites and Locations in Thailand
- 4 Dive Site: Hin Daeng and Hin Muang
- 5 Dive Site: Koh Dok Mai
- 6 Dive Site: Richelieu Rock, Koh Tachai, and Koh Bon
- 7 Dive Site: The Similan Islands
- 8 Dive Site: Chumphon Pinnacle
- 9 Dive Site: HTMS Sattakut Wreck
- 10 Dive Site: Sail Rock
- 11 Types of Diving in Thailand
- 12 Liveaboard Diving in Thailand
- 13 Video of Scuba Diving in Thailand
- 14 Scuba Diving Safety in 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)
Highlights: Large pelagics, cave dive, Grey Reef, and Leopard Shark sightings, and if you’re lucky, you can also spot a whale shark that occasionally hangs around this spot.
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.
Dive Site: Koh Dok Mai
Location: In the middle of Phuket and Koh Phi Phi (about 90 minutes by boat from Phuket)
Highlights: Several species of moray eels, large soft corals, sea horse, and leopard sharks which often lurk around.
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 5m straight in) leads to a huge cavern with fairly strong currents adding to the whole thrill and excitement of this dive spot.
Dive Site: Richelieu Rock, Koh Tachai, and Koh Bon
Location: Located between Similan and Surin Islands (only accessible by liveaboard)
Highlights: Possibility of seeing whale sharks, manta rays, and eagle rays.
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 is 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 that 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.
Dive Site: The Similan Islands
Location: Similan National Marine Park (Mostly explored on liveaboards)
Highlights: The untouched waters, the wide variety of corals and fish, leopard sharks, turtles, and the challenging maze-like swim-throughs and currents.
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 that 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.
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.
Dive Site: Chumphon Pinnacle
Location: Koh Tao
Highlights: Large schools of fish, colorful reef, and marine life.
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.
Dive Site: HTMS Sattakut Wreck
Location: Off of Koh Tao
Highlights: Aside from the wreck itself, Grey Reef Shark, Great Barracudas, Pufferfish and various Flatworms.
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.
Dive Site: Sail Rock
Location: North of Koh Samui, in between Koh Pha Ngan and Koh Tao
Highlights: Large schools of Yellow Fusiliers, Trevally, Giant Morays, Large Groupers, Batfish, and if you’re lucky, Whale Sharks.
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.
Types of Diving in Thailand
Diving in Thailand is a treat due to its tropical waters. It is home to over 2125 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 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.
If you enjoy wreck diving, you might want to consider heading to Pattaya, a place which is loosely labeled 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!
Search for your dream liveaboard in Thailand here!
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 divemasters you are diving with should be able to give you a full breakdown of 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.
For the ultimate diving adventure, be sure to check out liveaboards in Thailand!
Planning to travel around the Thai Islands? Check out a few of our guides
- A Guide to Choosing the Right Thai Islands to Visit
- 15 of the Best Beaches in Thailand that You NEED to Visit
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