Koh Rin is a group of four small islands ten kilometers from the mainland which have probably the best diving near Pattaya. There are several dive sites named as North Rock, Main Island and South Rock. All sites have a wide variety of aquatic life but are still different. Didiving and snorkeling offshore the main island is sheltered from the currents, shallower and therefore better for novice enthusiasts. The northern and southern rocks have some nice mini walls with stronger currents and more pelagic species. Many day tour boats, loaded with snorkelers, visit this small island as well.
North Rock or Hin Khao is a large granite rock, famous for its small rocky outcrops that are home to many species. It is one of the best places to start searching for small marine life such as nudibranchs and pipe fish. There is a wall of fifteen meters high swarmed with fish and covered in coral. South Rock or Hin Ton Mai is very similar to North Rock but with more excellent examples of hard and soft coral. A dive site named Koh Rin Bay near the main island is shallow and perfect for snorkelers. Fish life and coral are spectacular and even some sharks and stingrays can be spotted when you start diving towards the deeper sandy ocean floor. It is considered to be one of the top locations in the Pattaya region so try to visit this area.
North Rock Hin Khao
Hin Khao also known as North Rock has as much coral life as South Rock and has lots of rock outcroppings that are home to many sharks and eels. This is an excellent site for searching around for themore unusual nudibranchs, pipefish, razorfish and others that like to hide away. The site has good diving down to around 18 metres. Koh Rin bay is part of the main island of Koh Rin. Although this site only goes down to a maximum depth of 16 meters it is not well protected from currents and therefore should be dived when the currents are more favorable.The west side offers a very protected dive site that is excellent for training dives and is acceptable for qualified divers, especially when the currents and/or waves are strong. Just off Koh Rin on the west side there is a deep hole of over 40 meters deep with sometimes some interesting things to see and is perfect for the adventurous diver in times of currents.
Hin Ton Mai
Hin Ton Mai also known as South Rock is a very popular dive spot as the fish life is very varied with lots of Moray Eels and Barracuda. Very Large Marble Rays (250 CM wing tip to wing tip) have been spotted there, though not often. There are plenty of both hard and soft corals, coral whips as well as very good invertebrate life such as nudibranchs, brittle stars and feather stars. This site has very good coral life down to 22 metres.The south east and south side of the island offers yet again a different dive site. On the south east side, there are many well preserved corals, as not many people actually visit them and they are well populated by Yellow Jacks, Yellow Tail Fusiliers and Morays. In early September, 2011. We, in cooperation with The Dive Tribe, released around 30 Sharks in this area, including 2 Black Tip Reef Sharks, 10 Banded Bamboo Sharks and 18 Bamboo Sharks. Moving around to the south side, the corals thin out but the topography boast nice cliffs and valleys down to depth of about 14 meters.The secret dive site is a small wreck that attracts a swarm of yellow jacks as seen on the video that also attracts 6 to 8 very large Cobia Fish around 1 meter 50 cm plus long..