Koh Rang Ka Chio is a reef site located in the Koh Ngam Islands, offering a relaxed environment for both divers and snorkellers. The site features depths ranging from 3 to 12 metres, with an average of 8 metres, making it well-suited for beginners. Underwater terrain includes reef structures and seagrass beds. Access is by boat only, situated 8 kilometres from the shore. Divers can expect mild currents and visibility between 5 and 15 metres. Water temperatures typically range from 28 to 31C, though temperatures can occasionally drop to 17C, so a 3mm or 5mm wetsuit is recommended for comfort.

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 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.

Suntud Samut 4 is an artificial reef wreck located 1500 metres off the Koh Ngam Islands. Resting at depths between 35 and 40 metres, this site is intended for intermediate divers capable of managing deep diving risks, including nitrogen narcosis and overhead environments. Access is by boat only. Visibility is variable, ranging from 5 to 25 metres, and moderate currents are common. Divers should monitor bottom time closely and remain aware of potential entanglement hazards within the structure. Due to the depth and current, this site requires careful planning and a conservative approach to ascent.

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 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.

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 Kula is a shallow reef site located 500 metres from the shore of the Koh Ngam Islands. The site features depths ranging from 2 to 8 metres, with an average depth of 5 metres, making it suitable for beginners. Visibility typically varies between 5 and 15 metres. Access is by boat only, and divers should be aware of boat traffic and the potential for currents to strengthen unexpectedly. Always check conditions with a guide before entering the water and remain close to the vessel. Facilities available at the site include parking, toilets, showers, guided tours, and boat charters.