The shoal is few meters northwest from the rock, top is approx 5m deep.

Small rock and shoal just north from Joh Surin island.

Hin Kop is also known as Hin Rap.

Hin Kop

Koh Chi



West side of Koh Surin, just north to Koh Klang

Hin Pratumba is also known as Pachumba.

Hin Pratumba



Small rock located southeast of Koh Surin island.

Hin Gong is also known as Hin Kong.

Hin Gong



West side of Ko Torinla, south side of Koh Surin Island.

Ko Torinla West



East side of Ko Torinla, south of Koh Surin.

Ko Torinla East

 Locals call it "Plo Nam"  Rumor has it: discovered by Jaque Cousteu.
The best dive site in Thailand, but the viz is not excellent (Especially at large plankton blooms) (generally around 10m). Sealife is exceptional, large fish shoals Barracuda, Snapper, Trevally, also invertebrates...
Richelieu Rock has everything- Micro and macro. Porcelain crabs, Tiger Tail Sea Horses, Pipefish, Nudis, Harlequin Shrimp....
very little predator sharks
You can expect to see whale sharks (from february to may)
Whaleshark and Mantas both frequent the area. Best times are beginning and end of dive season when plankton blooms are highest.

The rock is located southeast of Surin Islands.
20 nm W of Kuraburi, Phang Nga

Richelieu Rock

Locals call it "Plo Nam" Rumor has it: discovered by Jaque Cousteu.
The best dive site in Thailand, but the viz is not excellent (Especially at large plankton blooms) (generally around 10m). Sealife is exceptional, large fish shoals Barracuda, Snapper, Trevally, also invertebrates...
Richelieu Rock has everything- Micro and macro. Porcelain crabs, Tiger Tail Sea Horses, Pipefish, Nudis, Harlequin Shrimp....
very little predator sharks
You can expect to see whale sharks (from february to may)
Whaleshark and Mantas both frequent the area. Best times are beginning and end of dive season when plankton blooms are highest.

The rock is located southeast of Surin Islands.
20 nm W of Kuraburi, Phang Nga

This is a small, remote island. It can be circumnavigated in a single dive.

There is a large atmospheric arch at the south west side at about 20m depth. Various crustaceans live beneath it.

There is a tunnel/cave right through the island from south to north at a depth of about 15m. Light is always visible from one end or the other and it is generally safe to pass through, although the visibility can reduce if the silt is kicked up. It is important to take the RIGHT HAND exit of the cave as the LEFT HAND exit is very tight to squeeze through. Inside the cave are many longlegged spiny lobsters. Occasionally tawny nurse sharks are seen inside the cave.

The oustide of the island forms a wall hosting a lot of interesting marine life. Highlights are nudibranchs, scorpionfishes, anemones and corals, occasional giant frogfishes etc..

In the channel between the main island and the smaller pinnacle to the east there is often a school of sawtooth barracuda.

Adjoining to the east is "Eagle's Nest", an alternative and deeper dive site which can be done as a separate dive.

Very occasionally grey reef sharks, bull sharks, whale sharks and manta rays can be seen around the island.

Dive site access is typically by liveaboard boat as part of a Mergui Archipelago cruise that takes in other sites such as Black Rock and Shark Cave. Most boats are based in Thailand.

Western Rocky Island

The reef gradually slopes down to the east of the two smaller islands immediately east of Western Rocky Island, finishing at a depth of around 35m. The character of the dive is different to Western Rocky Island itself. Entry can be near the 2 small islands, or straight into deeper water to the east of them. Highlights are giant sea fans, occasional zebra sharks, octopus, schools of snapper, anemones and corals. Stingrays may be seen deep at the eastern end of the reef. It is best to finish the dive by returning back to the two small islands, and perhaps even swim across the channel to Western Rocky Island itself if you have enough time and gas. A school of sawtooth barracuda is often seen here.

Typically accessed by liveaboard boat doing a Mergui Archipelago cruise. Most boats are based in Thailand.

Eagle's Nest

Tachai Reef is a 0-star rated scuba dive and snorkel destination in Thailand, Andaman Sea, Koh Surin which is accessible from shore based on 0 ratings.

Hin Kop

Snorkeling and Scuba Diving at Hin Kop