The Koh Surin is located in the Andaman Sea and covers an area of approximately 135 square km. From completely submerged pinnacles to fringing reefs, any variation can be found on this dive site. The Surin islands offer the most abundant coral spectrum in all of Thailand and divers can encounter eagle rays, turtles, and larger pelagics are possible here.

• Dive Type: Boat Dive
• Diver Level: Advanced Open Water Diver
• Max Depth: 30m

Richelieu Rock is one of the best places in the world to dive with whale sharks and is easily the best site in Thailand diving for this amazing activity. Here divers will encounter the largest fish in the ocean which are rare almost everywhere in the world. With nothing else for miles around, the whale sharks are attracted to the rock to feed on the rich plank tonic blooms that occur here.

• Dive Type: Boat Dive
• Diver Level: Novice Diver - 20 + Dives
• Max Depth: 40m

Koh Tachai is located in Tachai Island and lies about halfway between the Surin and Similan Islands and is rated as one of the best sites for Thailand scuba liveaboards as it's normally visited on the way to Richelieu Rock from the Similans. There are several dive sites around the island but the most famous is Koh Tachai Plateau which lies southeast of the island, about one kilometre offshore. The plateau is a submerged crowned reef of hard sheet corals, and scattered boulders. These boulders provide great swim-throughs and cut-through opportunities.

• Dive Type: Boat Dive
• Diver Level: Advanced Open Water Diver
• Max Depth: 35m

This dive site is one of the best places in Thailand to see manta rays, especially from April to May.
Koh Bon Island lies an hour or so north of the Similan Islands. It has a 33 metre wall on its south side, facing a small cove, with a stepped edge pointing west and down to over 40m.

Here divers will have the opportunity to see leopard sharks, white tip sharks; soft corals the colours of turquoise, yellow and green dominate. If you listen carefully you'll hear the warning clicks of hundreds of nervous damselfish, and the coral crunching of hungry titan triggerfish.

• Dive Type: Boat Dive
• Diver Level: Novice Diver - 20 + Dives
• Max Depth: 40m

Shark Point (Hin Musang), a small rock outcropping about 1½ hours East of Phuket, is a famous marine sanctuary due to its tremendous variety of marine life. The dive Shark Point site consists of 3 pinnacles. "Shark Point 1" is the northern-most, the one that breaks the surface. Next comes "Shark Point 2", rising to a depth of 7 meters, and further south lies "Shark Point 3", rising to 10 meters. All three scuba diving Thailand dive Shark Point pinnacles can be explored within the same dive.
Particular attractions you should look out for are the colourful soft corals, gorgonians and sea fans decorating the limestone pinnacle, the great range of tropical fish and the famous leopard sharks, often to be found resting on the sandy bottom. This site and the neighbouring Anemone Reef are also good for macro life.

• Dive Type: Boat Dive
• Diver Level: Open Water Diver
• Max Depth:

Koh Doc Mai means Flower Island and the dive site must be named for its underwater beauty because there are no flowers above the water. Koh Dok Mai is a small limestone islet rising vertically out of the sea. The site is mainly a wall dive down to 30 metres, with a hard coral stag horn reef sloping to the west. On the east side of the island are a series of caverns and caves which are great for practising penetration techniques.

• Dive Type: Boat Dive
• Diver Level: Advanced Open Water Diver
• Max Depth: 30m

This is one of the area's best scuba diving day trips sites for spotting leopard sharks and octopus. This place has it all. Leopard sharks are the norm, swimming along the wall or resting on the seabed with the stingrays down at around 20-25m. Whale sharks and manta rays are occasional visitors at this daytrips site too. On our swim through the rocks and coral we'll see a plethora of tropical marine life typical of Phi Phi Island. Green turtles and octopus are regularly sighted, as are seahorses.

• Dive Type: Boat Dive
• Diver Level: Advanced Open Water Diver
• Max Depth: 25m

Koh Ha is a group of five magical uninhabited islands, unspoiled and usually offering crystal clear waters. One of the highlights is diving the Twin Cathedrals, a large cave system that has formed into two large domes with a passage between them. This island group is a haven for marine life and divers alike! overwhelming beauty with caverns, caves, chimneys, swim throughs, soft coral covered walls, coral heads and sea bed. The marine diversity here will suit all divers with interesting macro such as sea horse and rare nudibrancs and good fish action plus squid, cuttlefish, lobsters, morays and more.

• Dive Type: Boat Dive
• Diver Level: Advanced Open Water Diver
• Max Depth: 20m

This dive site rivals its neighbor, in fact there really is no separating either site, apart from the landscape differing slightly, both sites teem with life and both make for amazing diving.

On one side there is an almost vertical wall with Gorgonian Sea Fans and soft red corals, as you swim mid water with the bottom sloping off into the deep, keep your eyes peeled for large pelagic fish that cruise these waters very frequently.

Another special feature here is the huge boulders that form swim throughs. There is also a valley that splits from part of the main island; it’s worth exploring this area too. The shallow side is around 15 meters, and then on the other side, it drops down quite deep.

Here you can find Red Tooth Trigger Fish and also Clown Trigger Fish favoring this area too. There is a mooring line which divers use to descend and ascend and usually there to greet them are the resident Bat Fish. These fascinating fish are very curios and seem to come very close to see especially if the diver rubs their fingers together.

Venturing further around the reef, it is quite visible how quickly it drops of into depth of blue; regular depth surveillance is recommended. The large pelagic fish are a common sighting in this particular part and this great spot to observe them, as they swoop in and gobble up any plankton that is in the area.

The whole rock is covered in absolutely stunning red soft corals, hence its name Hin Deang (Red Rock). The area attracts very small glass fish and bait fish, this attracts the more active Jacks and Trevally’s that come here to hunt and to terrorize the smaller fish.

If it’s possible, find a nice quite area, buoyancy permitting, and observe the show. It is fantastic. Better than any wildlife TV program. There is a huge school of Pickhandle Barracuda, also lone-wolf Great Barracuda’s, as they go lurking and quietly follow the diver, curious as to what the bubble blower is doing.

There is a huge variety of Moray Eels down there, including Honeycomb and Zebra morays, which are rarely seen elsewhere. Snake Eels have also been seen scuttling around the bottom. In fact the variety of macro life at Hin Daeng is unique to the area. Several species can only be found here.

The Harlequin box shrimp are not always easy to see, it takes a shrewd diver to realize that any four legged starfish may have been recent victims to these little critters.

• Dive Type: Boat Dive
• Diver Level: Open Water Diver
• Max Depth: 60m

The first pinnacle lies approximately 8 meters from the surface and drops down to 70 meters. Many divers have seen their first Manta Ray and or Whale Shark here, as these magnificent creatures are attracted by the deep drop-offs and plankton rich waters.

There is an abundance of soft corals, reds and particularly purples and this is where Hin Muang gets it name: Purple Rock in English, a beautiful site to see. The main feature, being the two large pinnacles you will find yourself diving in a figure of 8 as you admire the wonders around.

Again, this is a large dive site, over 200 meters in length and it’s very deep too, easy to go deeper than you planned for, so monitoring air and depth frequently is recommended.

Hin Muang is a completely submerged ridge, it is connected to Hin Deang, but it would take a foolhardy diver who would attempt this 500 meter swim, at over 70 meters depth, without a fully operational nuclear submarine.

Again, here as on its sister site, there is loads of predatory action here, huge Rainbow Runners hunting beside Giant Trevally. The attacks on the small bait fish can be relentless. Other fish life in the area: Schools of Squid, Large Red Octopus scampering across the reefs, Black Fin Barracuda and Yellow Tail barracuda too.

The amount of macro life here will have the photographer drooling, Pipefish, Blennies, Gobies all hiding among the small cracks and crevices of the rock. Searching around the huge Gorgonian Sea fans will also yield a fantastic wealth of macro life.

The only downside to this site is there is never enough time to see it all, so at least two dives are needed here. As the minimum depth is 8 meters, it is quite a deep site to tackle and the currents can be strong creating excellent drift diving.

• Dive Type: Boat Dive
• Diver Level: Open Water Diver
• Max Depth: 70m

Koh Bida Nok is the sister dive site of Koh Bida Nai located 2 km south of Koh Phi Phi Ley. It is regarded as one of the best diving spots of Koh Phi Phi. The Marine life is teeming and you can spot various Sharks like Blacktip, Leopard Sharks, Nurse Sharks as well as turltes and Moray Eels. It is not rare to also see a banded sea snake. From December to February, It is sometimes possible to spot a Manta ray or even a whale shark if you are very lucky! The wall is covered by superb Sea Fans dancing in the current. The maximum depth is 33 meters deep and the current can be strong, so this site is more suitable for advanced divers. The spot is also called “Outer Father”. As it is an excellent dive site it often visited by Liveaboards from Phuket or Khao Lak

• Dive Type: Boat Dive
• Diver Level: Open Water Diver
• Max Depth: 33m