Lang Khaai Bay at Koh Nang Yuan provides a sheltered reef environment suitable for beginners. The site features a mix of hard and soft corals, alongside a cave and cavern system. Depths range from 5 to 23 metres with an average of 15 metres. Visibility typically spans 10 to 25 metres, supported by mild currents. Divers may access the site via shore or boat. Due to the presence of sharp coral and rocks, as well as overhead environments within the cave and cavern, careful buoyancy control is required. On-site parking is available for convenience.

Mao Bay at Koh Nang Yuan features a combination of natural reef and artificial reef structures. This site is suitable for beginners, with depths ranging from 1 to 20 metres and an average depth of 10 metres. Divers experience mild currents and visibility between 8 and 20 metres. Marine life recorded here includes wrasses, porcupinefish, Titan triggerfish, and Bluespotted Fantail rays. Other species present are Pink Skunk anemonefish, Longfin bannerfish, and Blacktip grouper. Divers should be cautious of sharp edges on both the natural coral and artificial structures. Access is by boat, and dives typically last 45 minutes.

Laem Thian is a cape located on the east coast of Koh Nang Yuan, Thailand. This site features a diverse underwater topography consisting of reefs, walls, caverns, and swim-throughs suitable for intermediate divers and snorkellers. Depths range from 3 to 35 metres, with an average of 15 metres. Divers may encounter species including wrasses, blue-barred parrotfish, porcupinefish, pink skunk anemonefish, golden butterflyfish, longfin bannerfish, moon wrasse, scissortail sergeant, rabbitfish, and bluespotted fantail ray. Hard corals, cabbage corals, zoanthids, and sea cucumbers are also present. Access is by boat only, with mild currents and visibility between 10 and 30 metres. Hazards include overhead environments, sharks, sharp coral, strong currents, and surge.

Laem Thian Pinnacle is a shore-accessible site near Koh Nang Yuan featuring a combination of pinnacle, reef, and cave topography. Divers can explore depths ranging from 5 to 35 metres, with an average depth of 18 metres. The site is subject to moderate currents, which can create drift conditions and occasional rip or down currents around the structure. Visibility varies significantly between 8 and 30 metres. The cave section presents an overhead environment that requires careful navigation. Shore entry requires assessing the surf conditions before entering. Due to the depth and current conditions, this site is suited for intermediate divers with strong buoyancy control.

King Kong Rock is a reef and artificial reef site located 500 metres off the coast of Koh Nang Yuan. The site features depths ranging from 5 to 30 metres, with an average depth of 14 metres. Access is exclusively by boat, and the site is suited for intermediate divers. Conditions typically include mild currents and visibility between 10 and 25 metres. Water temperatures remain warm throughout the year, ranging from 28 to 31 degrees Celsius. Divers should be aware of potential hazards, including jellyfish and stonefish. A typical dive at this location lasts approximately 45 minutes.

HTMS Hanhak Sattru is a decommissioned naval vessel resting at depths between 13 and 24 metres near Koh Nang Yuan. As an artificial reef, the wreck features a complex superstructure that requires steady buoyancy control due to moderate currents. Visibility typically ranges from 14 to 30 metres, allowing for clear views of the vessel. The site includes enclosed sections that present an overhead environment, necessitating caution and the use of a dive torch for those entering the hull. This site is suitable for intermediate divers, with boat access required for all visits. Night diving is available, offering opportunities to observe nocturnal activity within the structure.

Koh Nang Yuan offers a diverse underwater environment featuring coral reefs, submerged pinnacles, shipwrecks, and artificial reef structures. The site is suitable for all skill levels, with depths ranging from 4 to 40 metres and an average depth of 15 metres. Divers and snorkellers can access the area via shore or boat. Conditions vary, with visibility between 5 and 30 metres and mild currents. Facilities available include air fills, equipment rental, guided tours, parking, toilets, showers, changing rooms, and a cafe. Night diving is permitted. Hazards include boat traffic, deep sections, jellyfish, low visibility, nitrogen narcosis, sea urchins, sharp coral, and strong currents.

Aow Leuk is a wide, shallow bay located on the east side of Koh Tao. The site features a sandy bottom, natural coral reefs, and artificial reef projects consisting of concrete block sculptures. Divers and snorkellers can explore depths ranging from 5 to 15 metres, with an average depth of 8 metres. The site is suitable for beginners and accessible by both boat and shore. Visibility typically ranges from 5 to 20 metres, and currents are generally mild. Facilities available at the site include a cafe, restaurant, toilets, equipment rental, and accommodation. Night diving is permitted, with typical dives lasting 45 minutes.