Koh Tachai Reef is a marine site featuring a combination of reef, pinnacle, and drop-off topography. Located 70 kilometres from shore, this site requires boat access and is suited for intermediate divers due to the presence of strong currents. Depths range from 5 to 40 metres, with an average depth of 25 metres. Visibility varies between 10 and 40 metres, and water temperatures remain warm throughout the year, typically between 28 and 31 degrees Celsius. Divers should be aware of hazards including deep water, strong currents, and sharp coral. Night diving is permitted at this location, with typical dives lasting 60 minutes.

Hin Luang is a submerged pinnacle and reef system located 200 metres from Koh Tachai. The site features a wall topography with depths ranging from 18 to 45 metres, averaging 30 metres. Due to the strong currents and significant depth, this site is suitable for intermediate divers. Boat access is required for all dives. Visibility typically ranges between 15 and 30 metres. Water temperatures remain between 28 and 31 degrees Celsius, though thermoclines can create cooler layers at greater depths. Divers should be prepared for deep conditions and strong currents throughout the dive.

Turtle Rock is a reef site located off Koh Tachai, Thailand, accessible only by boat. The site features a depth range of 5 to 30 metres, with an average depth of 12 metres. Divers and snorkellers can expect mild currents and visibility ranging from 10 to 30 metres. Water temperatures remain consistent throughout the year, typically between 27 and 30 degrees Celsius. The site is suitable for beginners and supports night diving, with typical dives lasting around 45 minutes. Due to the nature of the location, boat traffic is a noted hazard for divers and snorkellers to monitor during their time in the water.

Ko Bon Pinnacle is a challenging deep-water site located 200 metres off Koh Bon. This submerged pinnacle features a wall and drop-off topography, with depths ranging from 18 to 39 metres. Due to strong currents and potential down currents, this site is strictly for advanced divers. Visibility varies between 10 and 30 metres, and divers may encounter cold water gusts and plankton blooms. Marine life frequently recorded here includes giant moray, coral grouper, titan triggerfish, moorish idol, and various groupers. Rarer sightings include harlequin shrimp, emperor angelfish, day octopus, sea krait, spotfin lionfish, and regal angelfish. Boat access is required for all dives, which typically last 35 minutes.

Koh Bon Ridge is a diverse site featuring a reef, wall, and pinnacle topography. Divers can navigate from the North Ridge across the West Ridge and into the bay. The site offers depths ranging from 5 to 45 metres, with an average depth of 25 metres. Access is strictly by boat due to its distance from shore. Conditions are variable, with strong currents and potential down currents, making this site suitable for intermediate divers. Visibility typically ranges between 10 and 40 metres. Water temperatures remain consistent between 29 and 30C, though thermoclines and cold water gusts associated with plankton blooms occur. Night diving is available at this location.

Torinla Reef at Koh Bon is a marine dive site situated 60 kilometres from the shore. The reef features depths ranging from 5 to 20 metres, with an average depth of 18 metres. Divers should expect moderate currents and visibility typically between 20 and 30 metres. Access to this site is by boat only, and the location is suited for intermediate divers. Hazards include the depth, sharp coral, and strong currents. Water temperatures remain consistent throughout the year, ranging between 29 and 30 degrees Celsius.

Torinla Reef is a pinnacle and wall site located at Richelieu Rock. This offshore location features a diverse topography including reef structures and walls, with depths ranging from 5 to 40 metres and an average depth of 18 metres. Access is strictly by boat due to its distance from the shore. Divers and snorkellers can expect mild currents and visibility between 15 and 30 metres. Water temperatures typically range from 28 to 31C, though sudden thermoclines can cause drops of 5 to 7C. The site is suitable for intermediate divers and supports night diving. Hazards include deep water, strong currents, surf, and sharp coral.

Ko Torinla West at Richelieu Rock features a shallow reef top and a wall descending to 40 metres. Divers can explore the coral garden at 5 metres or engage in a drift dive along the wall. The site is suitable for intermediate divers, with mild currents that can strengthen quickly. Visibility ranges from 10 to 30 metres, and water temperatures remain warm between 28 and 31C. Hazards include sharp coral, lionfish, and deep sections. Night diving is available at this location. Species recorded around this area include various angelfish, moray eels, triggerfish, trevally, sweetlips, wrasses, parrotfish, butterflyfish, and surgeonfish.