Sam Laem is a reef dive site located at the Koh Ngam Islands, named for its distinctive underwater topography featuring three pillars arranged in a triangular formation. The site reaches a maximum depth of approximately 27 to 30 metres and offers visibility up to 20 metres. Access is by boat only, and the site is suited for intermediate divers due to moderate currents and depth. Divers should remain aware of boat traffic in the area. Water temperatures are consistent, ranging between 28C and 31C throughout the year.

Koh Ran is a reef site located in the Koh Ngam Islands, Thailand, accessible only by boat. The reef structure descends from 10 metres to a maximum depth of 30 metres, with an average depth of 12 metres. Divers and snorkellers can expect mild currents and visibility ranging from 10 to 25 metres. Surge and swell can develop, which may impact boat entry and exit; it is recommended to time these movements carefully. This site is suited for intermediate divers, with typical dives lasting around 45 minutes. Water temperatures remain warm throughout the year, ranging between 28 and 31 degrees Celsius.

Koh Jorakea in the Koh Ngam Islands features a combination of natural reef and artificial reef structures. This site is suitable for beginner divers, offering a manageable underwater landscape with depths reaching 14 metres. The environment is characterised by mild currents and warm water temperatures ranging from 28 to 31 degrees Celsius. Divers should be aware of an entanglement risk associated with the artificial reef structures and are advised to monitor their equipment closely to avoid lines or debris. As visibility can vary significantly, it is recommended to check with local dive operators regarding current conditions before planning a trip.

Hin Look Bat is a diverse marine site located in the Koh Ngam Islands featuring a combination of a pinnacle, reef, wall, and cave. Accessible only by boat, the site offers depths ranging from 5 to 30 metres with an average of 20 metres. Conditions vary significantly, with visibility fluctuating between 2 and 30 metres and moderate currents present. Divers should be aware of potential surge and sharp coral structures. Due to the depth and current, beginners are advised to remain in the shallower sections of the reef. Water temperatures are consistently warm, ranging from 28C to 31C throughout the year.

Hin Pae is a diverse marine site located at the Koh Ngam Islands, featuring a combination of natural reef, pinnacle, and artificial reef structures. The site offers depths ranging from 6 to 24 metres, with an average depth of 12 metres. Suitable for intermediate divers, the site requires boat access and is subject to moderate currents and surge. Visibility varies significantly, ranging from 5 to 30 metres. Water temperatures remain warm throughout the year, typically between 28C and 31C. Typical dives at this location last approximately 45 minutes.

Koh Ngam Yai is a reef site located 17 kilometres from the shore in the Koh Ngam Islands. Suitable for beginners, the site features depths ranging from 5 to 20 metres with an average of 15 metres. Divers and snorkellers experience mild currents and water temperatures between 28 and 31 degrees Celsius. Visibility is variable, ranging from 5 to 30 metres depending on conditions. Access is by boat only. Hazards include sharp coral and rocks, so maintain distance from the reef structure. If triggerfish display aggressive behaviour, move away calmly and avoid blocking their path to open water. Guided tours, equipment rental, and air fills are available locally.

Hin Chedi is a pinnacle and reef site located at the southernmost tip of Ko Ngam Yai. The underwater topography consists primarily of loose boulder formations, which provide a substrate for extensive anemone fields. Divers can expect depths ranging from 5 to 16 metres, with an average depth of 10 metres. This site is suitable for beginners and is accessible only by boat. Conditions include mild currents and visibility ranging from 5 to 20 metres. Water temperatures remain warm throughout the year, between 28C and 31C. Night diving is permitted at this location, with typical dives lasting 45 minutes. Be aware of potential entanglement hazards and the presence of triggerfish.

Koh Ngam Noi is a reef and wreck site located 17 kilometres off the coast of Chumphon. Characterised by craggy limestone formations, the site features swim-throughs at its southern end. The underwater topography supports a variety of reef fish and invertebrates typical of the Gulf of Thailand. Depths range from 5 to 18 metres with mild currents and visibility varying between 5 and 30 metres. Access is by boat only. Divers and snorkellers should be aware of potential hazards including entanglement, low visibility, sea urchins, and sharp coral. Night diving is permitted at this location, which offers basic toilet facilities for visitors.