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.

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.

South Tip at Koh Racha Noi is a challenging drift dive site consisting of a series of pinnacles extending south from the island. The topography includes a wall and reef structure that reaches depths between 9 and 50 metres, with an average depth of 20 metres. Due to strong currents, down currents, and the potential for decompression requirements, this site is strictly for advanced divers. Access is by boat only. Visibility varies significantly, ranging from 5 to 40 metres. Divers should be prepared for deep diving conditions and the associated risks of nitrogen narcosis.

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.

Koh Haa Yai is a diverse marine site featuring a complex topography of reefs, walls, canyons, and caverns. Located 16 kilometres from shore, this site requires boat access and is suited for intermediate divers due to the potential for strong currents and deep sections reaching 45 metres. The average depth is 18 metres, with visibility ranging from 15 to 40 metres. The environment supports a variety of reef fish and invertebrates typical of the region. Divers should be prepared for overhead environments within the caverns and manage their depth carefully throughout the typical 55-minute dive.

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.

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.