Manta Bay at Koh Racha Noi offers a diverse underwater environment featuring a reef, wall, and artificial reef. Suitable for beginners, the site reaches depths of 3 to 17 metres with an average of 15 metres. Access is by boat only. Visibility varies significantly from 10 to 40 metres. While currents are generally mild, divers should remain alert for occasional down currents. Species recorded around this area include peacock mantis shrimp, giant moray, Indian lionfish, pharaoh cuttlefish, sea krait, snowflake moray, zebra lionfish, reef stonefish, coral grouper, titan triggerfish, spotfin lionfish, moorish idol, porcupinefish, and melon butterflyfish. Always monitor for jellyfish and exercise caution near the seabed to avoid stonefish.

The Rock is a deep-water pinnacle located off Koh Racha Noi, featuring dramatic topography that descends from 30 to 55 metres. This site is reserved for advanced divers due to the significant depth and strong, unpredictable currents. Visibility typically ranges between 10 and 30 metres. Water temperatures generally sit between 29 and 31C, though nutrient-rich currents can occasionally drop temperatures to 25C. Divers must manage buoyancy and gas consumption carefully, as the current can pull swimmers away from the structure. Hazards include decompression risks, nitrogen narcosis, and venomous species such as stonefish and lionfish that inhabit the reef structure. Boat access is required for all dives at this location.

Ashitol Bay is a reef dive located at Koh Racha Noi, Thailand, accessible only by boat from Koh Phuket. The site features depths ranging from 15 to 30 metres, making it suitable for divers with an Open Water certification. Divers can expect mild currents and visibility between 10 and 25 metres. Water temperatures typically range from 29 to 31C, though the area can experience thermoclines, so a wetsuit is recommended. A typical dive lasts approximately 45 minutes. As conditions can vary, it is advisable to check locally for current boat schedules and seasonal variations before planning a trip.

Camera Bay, located on the north-western section of Koh Racha Noi, offers a diverse diving environment ranging from 5 to 30 metres. The site features a mix of natural reef and artificial structures. The inner bay is typically calm and free of currents, making it suitable for beginner divers. Beyond the bay, the topography transitions to rocky edges where divers may encounter mild currents and drift conditions. Visibility at this site ranges from 10 to 40 metres, with water temperatures consistently between 29 and 31C. Access to Camera Bay is by boat only.

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.

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.

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.

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.