Dive Supply at Koh Nang Yuan features a combination of reef and pinnacle topography suitable for beginner divers. Accessible via shore entry, the site offers depths ranging from 5 to 28 metres with an average of 16 metres. Currents are generally mild, though visibility fluctuates between 5 and 20 metres. Water temperatures remain warm, typically between 28 and 31 degrees Celsius. The site is also open for night diving, which allows for observation of different nocturnal behaviours. Divers should maintain neutral buoyancy to avoid contact with sharp coral and rocks, and remain aware of potential jellyfish in the water.

Rainbow Reef at Koh Nang Yuan offers an accessible shore entry for both divers and snorkellers. The site features a shallow reef structure ranging from 1 to 6 metres in depth, with an average of 3 metres. Visibility varies between 5 and 25 metres, and water temperatures remain warm throughout the year. Divers and snorkellers can observe species including sling-jaw wrasse, longfin bannerfish, golden butterflyfish, blue-barred parrotfish, rock cod, rabbitfish, scissortail sergeant, moon wrasse, barred soapfish, and long-spined sea urchin. While currents are generally mild, they can strengthen unexpectedly. Visitors should be cautious of sharp coral in the shallows and avoid contact with the reef structure.

Three Rocks is a reef and pinnacle site located 800 metres off the coast of Koh Nang Yuan. The site is suitable for beginners, with an average depth of 5 metres and a maximum depth of 14 metres. Divers can expect mild currents and visibility ranging from 2 to 30 metres. Marine life recorded at the site includes wrasses, sling-jaw wrasse, triggerfish, Jorunna nudibranch, longfin bannerfish, rock cod, golden butterflyfish, pink skunk anemonefish, rabbitfish, long-spined sea urchin, Caribbean barrel sponge, barred soapfish, scissortail sergeant, and sea cucumber. Access is by boat only. Be aware of boat traffic and sea urchins in the area. Night diving is permitted.

AlotMeant is a coral reef restoration project located at Koh Nang Yuan. Developed under the guidance of the Department of Marine and Coastal Resources, the site features custom-built structures on the seabed where salvaged coral fragments are attached to encourage growth. This artificial reef environment is suitable for beginners, with depths ranging from 5 to 8 metres and an average depth of 6 metres. Divers can access the site via shore or boat. Conditions are generally mild with visibility between 5 and 15 metres. Water temperatures remain warm throughout the year, typically between 28 and 31 degrees Celsius. Divers should be aware of sharp coral in the area.

Junkyard is an artificial reef located 500 metres off Koh Nang Yuan. This site features a mix of structures and wrecks, offering a varied topography that reaches depths between 3 and 32 metres, with an average depth of 9 metres. Divers can encounter wrasses, rabbitfish, rock cod, golden butterflyfish, sling-jaw wrasse, pink skunk anemonefish, coral trout, longfin bannerfish, barred soapfish, scissortail sergeant, sea cucumbers, snails, and long-spined sea urchins. Conditions are generally mild, though visibility fluctuates between 2 and 30 metres. Access is by boat only. The site is suitable for beginners and supports night diving, with water temperatures ranging from 27 to 31 degrees Celsius.

Ban's Artificial Reef at Koh Nang Yuan is a diverse artificial reef and coral transplant site featuring a wide array of submerged structures. Divers can explore a buoyancy obstacle course, a school house, and various sculptures including a whaleshark, a turtle, rays, and farm animals, alongside sunken vehicles. The site offers depths ranging from 2 to 40 metres, with an average depth of 8 metres. Suitable for beginners, the site experiences mild currents and visibility between 5 and 30 metres. Access is available by both shore and boat. Facilities include equipment rental, air fills, and rinse stations, making it a well-supported location for divers.

Sai Nuan Beach is a reef site located on Koh Tao, offering a peaceful environment for both divers and snorkellers. The site features a shallow reef with depths ranging from 1 to 5 metres, averaging 3 metres. Entry is directly from the shore. Conditions are generally mild with visibility between 5 and 25 metres. Water temperatures remain warm throughout the year, fluctuating between 28C and 31C. The site is suitable for beginners, though visitors should remain aware of boat traffic, sea urchins, and sharp coral. Facilities available at the beach include a cafe, toilets, showers, and equipment rental.

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.