Ray Bahn is a deep reef site located at Koh Racha Noi, Thailand, characterised by its significant depth and challenging conditions. The reef structure drops from 23 to 40 metres, with an average depth of 20 metres. Divers must be prepared for strong, shifting currents that require careful air management and advanced diving skills. Visibility typically ranges between 10 and 30 metres, and water temperatures remain between 28 and 30C, though regular thermoclines occur. Access is by boat only, and the use of a reef hook is recommended to maintain position against the flow. Due to the depth and current, this site is strictly for advanced divers.

Racha Noi Bay features a diverse underwater landscape comprising reefs, drop-offs, pinnacles, and artificial structures. Located off Koh Racha Noi, the site offers depths ranging from 5 to 30 metres with an average of 20 metres. Visibility typically spans 10 to 30 metres, though thermoclines may occasionally reduce this. While currents are generally mild, strong currents and down currents can develop rapidly near drop-offs and pinnacles. Divers should remain close to their guide and monitor depth closely. Access is by boat only, and the site is suitable for beginners, though conditions require attention to briefings. Species recorded around this area include peacock mantis shrimp, Indian lionfish, and various triggerfish.

Aussie Reef at Koh Racha Noi is a drift dive site featuring hard corals in the shallows and deep coral bombies. The site offers depths ranging from 3 to 30 metres, with an average depth of 15 metres. Access is by boat only, as the site is located 24 kilometres from shore. Divers should be prepared for moderate currents and variable visibility between 10 and 30 metres. Due to the potential for strong currents, surf, and deep water, this site is suited for intermediate divers. Water temperatures remain consistent throughout the year, typically between 28 and 30 degrees Celsius.

Koh Racha Noi offers diverse topography including reefs, walls, pinnacles, and drop-offs. The site features a shallow bay ranging from 3 to 10 metres, suitable for training, while the outer sloping reef extends to depths of 30 metres. Accessible only by boat, the site is suited for intermediate divers due to moderate currents and potential down currents. Visibility typically ranges from 10 to 40 metres, though thermoclines can occasionally affect clarity. Water temperatures remain warm, averaging between 28 and 30 degrees Celsius. Species recorded around this area include various reef fish, moray eels, and triggerfish. Divers should be aware of deep water and strong currents.

South Tip at Koh Racha Noi is a reef and drop-off site characterised by its topography and potential for strong currents. The site offers a wide depth range from 3 to 80 metres, with an average depth of 12 metres. Access is strictly by boat, and the site is suited for intermediate divers due to the challenging current conditions. Visibility varies between 10 and 40 metres. Species recorded around this area include Indian Lionfish, Moorish Idol, Porcupinefish, Peacock Mantis Shrimp, and Giant Moray. Facilities available for divers include air fills, equipment rental, and guided tours.

South Tip at Koh Racha Noi offers a varied underwater landscape featuring a wall, pinnacle, and artificial reef. This boat-access site ranges from 3 to 25 metres in depth, with an average of 15 metres. Visibility typically spans 10 to 40 metres. Divers should be prepared for moderate currents, which can shift quickly and occasionally produce downward pulls. Due to these conditions, the site is best suited for experienced divers who can manage depth and drift. Species recorded around this area include various lionfish, triggerfish, moray eels, and groupers. Always confirm current conditions with your boat captain before descending and plan your dive around slack water when possible.

Marina Bay and the adjacent Marita’s Rock at Koh Racha Noi offer a topography defined by granite rock formations that extend from the hillside into the water. Divers navigate a series of swim-throughs and cavernous structures that follow the underwater contours of the island. The site reaches depths between 5 and 40 metres, with an average depth of 21 metres. Access is exclusively by boat, and the site is suited for intermediate divers due to moderate currents and potential surge. Visibility ranges from 10 to 40 metres, and water temperatures remain consistent between 29 and 31 degrees Celsius throughout the year.

Banana Bay at Koh Racha Noi offers a diverse underwater landscape featuring reefs, pinnacles, walls, and drift sections. Suitable for all skill levels, the site provides depths ranging from 2m to 45m with an average of 15m. Divers and snorkellers can expect visibility between 10m and 30m, with mild currents typical of the area. Access is strictly by boat, located 20km from the shore. Water temperatures remain warm, generally between 29C and 31C. Hazards to be aware of include boat traffic, potential entanglement, sharp coral, stonefish, and strong currents. Guided tours and boat charters are available for those visiting this site.