Koh Rang National Park offers a diverse underwater landscape featuring reefs, pinnacles, and artificial structures including wrecks. Depths range from 9 to 30 metres, with an average of 15 metres. Access is by boat only, as the site is located 10 kilometres from shore. Conditions vary, with visibility between 5 and 30 metres and moderate currents that can strengthen quickly, especially around pinnacles. The site is suitable for intermediate divers and supports night diving. Guided tours are recommended to navigate the terrain and manage changing conditions. Hazards include sharp coral and stonefish, so maintain neutral buoyancy and avoid contact with the substrate.

Ko Rang is a protected marine park site in the Gulf of Thailand offering a mix of reef and muck diving. Suitable for beginners, the site features depths between 6 and 13 metres with an average of 10 metres. Divers access the site by boat, where they encounter mild currents and visibility ranging from 5 to 20 metres. The topography includes sandy patches and reef structures that require a slow, patient pace to explore. Divers should remain aware of potential surf and surge at the surface during boat entry and be prepared for currents that can strengthen without warning.

Hin Kuak Ma is a reef pinnacle located in Koh Rang National Park. Reached by boat, this site features depths ranging from 10 to 16 metres, making it suitable for beginner divers. The environment is characterised by mild currents and water temperatures between 29 and 31 degrees Celsius. Visibility fluctuates between 5 and 25 metres, often appearing clearest during morning hours. Divers should be aware that stonefish are present at this site, camouflaging against the reef and sandy seabed. To protect the environment and avoid injury, do not touch the reef or rest on the bottom. A typical dive duration at this location is 50 minutes.

Koh Thian is a small island located on the west coast of Koh Rang National Park. The site features two distinct topographies: a protected side with shallow, healthy coral reefs and an exposed side characterised by deeper, large rock formations and caves. Divers and snorkellers can explore depths ranging from 3 to 18 metres, with an average depth of 10 metres. Access is strictly by boat, and the site is suited for intermediate divers due to potential strong currents and surf. Visibility varies between 5 and 20 metres, and water temperatures remain warm throughout the year, typically between 29 and 31 degrees Celsius.

Koh Yak Lek is a reef site located within Koh Rang National Park. The topography features a reef that circles the island, offering a variety of coral formations. Divers can explore depths ranging from 5 to 30 metres, with an average depth of 8 metres. Access to the site is by boat, as it is situated 1000 metres from the shore. Conditions are generally mild, with visibility ranging from 5 to 25 metres and water temperatures between 28 and 31C. This site is suitable for beginners and typically involves a 50-minute dive. Guided tours are available through local dive shops.

Koh Thian is a reef site located 1000 metres from shore in Koh Rang National Park. This site offers depths ranging from 5 to 15 metres, with an average depth of 10 metres. Access is by boat only. Divers and snorkellers experience mild currents and visibility between 5 and 20 metres. The water temperature remains consistently warm, between 29C and 31C. Due to the presence of jellyfish and sharp coral, wearing a wetsuit is recommended for protection. The site is suited for intermediate skill levels, and guided tours are available to help locate the most rewarding sections of the reef.

Na Tham in Koh Rang National Park offers a unique combination of a shallow cave, reef, and wall topography. The site is accessible by boat and features depths ranging from 3 to 12 metres, making it suitable for beginners. Divers navigate a mild current with visibility typically between 5 and 20 metres. The cave creates an overhead environment, requiring divers to maintain orientation and keep the exit in sight. A torch is recommended for the cave entrance. Divers should exercise caution to avoid contact with sharp coral and rocks along the wall and reef structures. Facilities including toilets and showers are available.

Hin Luk Bat in Koh Rang National Park features a combination of natural reef and artificial structures. Suitable for beginners, the site offers depths ranging from 5 to 30 metres, with an average depth of 15 metres. Divers and snorkellers can access the site from the shore. Conditions include mild currents and visibility between 5 and 20 metres. Water temperatures remain warm, between 28 and 31C throughout the year. Night diving is available for those seeking a different experience. Hazards include jellyfish and sharp coral, so protective clothing is recommended. Always check current visibility with the on-site dive shop before entering the water.