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.

HTMS Prab 741 is a decommissioned US Navy vessel, originally commissioned in 1944, now serving as an artificial reef near the Koh Ngam Islands. The wreck lies at depths between 10 and 24 metres, with an average depth of 21 metres. Access is by boat only. Divers encounter mild currents and visibility ranging from 5 to 25 metres. The site is suitable for beginners, though it presents hazards including overhead environments, potential entanglement, and sharp coral. The habitat supports a variety of reef fish and invertebrates typical of the Gulf of Thailand. Water temperatures remain warm throughout the year, ranging from 28C to 31C.

Koh Lak Ngam features a combination of reef and pinnacle structures located 800 metres from shore. This site is suitable for beginners, with depths ranging from 5 to 23 metres and an average depth of 15 metres. Divers access the site by boat. Conditions include mild currents and visibility typically between 5 and 10 metres. Water temperatures remain consistent, ranging from 28 to 31C throughout the year. Divers should maintain good buoyancy to avoid contact with sharp coral and rocks, and ensure all equipment is secured to prevent entanglement with loose lines near the reef structures.

Hin Lak Ngam is a pinnacle and reef site located 2500 metres from shore in the Koh Ngam Islands. The site features two rocky outcrops with depths ranging from 5 to 20 metres, averaging 15 metres. Divers and snorkellers encounter a variety of coral structures, including staghorn, table, brain, cabbage, and black coral, alongside barrel sponges and anemone beds. Conditions are generally mild, with visibility varying between 5 and 25 metres. Access is by boat only. The site is suitable for beginners and supports night diving. Hazards include potential entanglement, variable visibility, and sharp coral.

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.

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.