Mango Bay is a wide, shallow bay located at Koh Nang Yuan, featuring a combination of natural reef and artificial reef structures. The site is fringed by reefs along its coastlines, with the west side characterised by reef-framed boulders. Depths range from 1m to 20m, with an average of 9m, making it suitable for beginners. Visibility typically fluctuates between 8m and 20m. Access is available via both shore and boat. Divers and snorkellers should be aware of boat traffic in the area and sharp coral. Facilities at the site include a cafe, restaurant, bar, rinse station, equipment rental, and toilets.

Hin Wong Bay is a large, horseshoe-shaped bay located on the north-east coast of Koh Tao. This site features a diverse topography including reefs, caves, pinnacles, drop-offs, and artificial structures. Depths range from 2 to 40 metres, with an average of 18 metres. Divers and snorkellers can encounter species such as Blue-barred Parrotfish, wrasses, Rabbitfish, and hard corals. Less frequently, visitors may spot Harlequin Sweetlips, Titan Triggerfish, Golden Butterflyfish, Longfin Bannerfish, and Magnificent Giant Anemone. Conditions vary with visibility between 2 and 25 metres and mild currents. Thermoclines may occur, and hazards include boat traffic and sharp coral. Access is available via both shore and boat, with facilities including equipment rental and guided tours.

Hin Wong Pinnacle is a reef and pinnacle site located near Koh Nang Yuan. The site offers depths ranging from 5 to 30 metres, with an average depth of 15 metres, making it suitable for beginners. Access is by boat only. Visibility is variable, ranging from 5 to 30 metres, and currents are generally mild but can strengthen. Water temperatures remain warm throughout the year, typically between 28 and 31 degrees Celsius. The site features a complex structure of rock and coral, which is also available for night diving. Divers should be aware of potential hazards including jellyfish, sharp coral, and fluctuating visibility.

Leamnamtok is a shore-entry muck diving site located at the Northwest Pinnacles in Thailand. The site features depths ranging from 5 to 16 metres, with an average depth of 8 metres, making it suitable for beginner divers. Visibility typically fluctuates between 5 and 10 metres, and divers should be prepared for moderate currents. The seabed consists of rocks and coral, requiring careful buoyancy control to avoid contact with sharp surfaces. Stonefish are present on the substrate, so divers should avoid touching the bottom and shuffle their feet when entering from the shore. Night diving is permitted at this location, and a dive torch is recommended to assist with spotting small organisms in the substrate.

The HTMS Sattakut is a 49-metre-long former navy vessel resting as an artificial reef near Koh Nang Yuan. The wreck lies at depths between 18 and 32 metres, with an average depth of 27 metres. Access is by boat only, as the site is located 800 metres from shore. Conditions vary, with visibility ranging from 2 to 30 metres and moderate currents. Divers should be aware of a potential thermocline at 25 metres, which can affect both temperature and visibility. Due to the depth and overhead environment, this site is suitable for advanced divers. Night diving is permitted at this location.

Bio Rock is an artificial reef located 250 metres off the shore of Koh Nang Yuan. This site features depths ranging from 5 to 15 metres, with an average depth of 13 metres. It is suitable for beginners and accessible via boat. Divers can expect mild currents and visibility between 10 and 25 metres. Marine life frequently encountered includes Titan Triggerfish, Bluespotted Fantail Ray, Blue Ringed Angelfish, and various wrasses. Other species such as Harlequin Sweetlips, Golden Butterflyfish, Pink Skunk Anemonefish, and groupers are also present. Hazards at this site include boat traffic, sharp coral, and stonefish. Water temperatures remain warm throughout the year, typically between 28 and 31 degrees Celsius.

Sairee Reef, located off Koh Nang Yuan, provides a shallow, accessible environment for beginner divers. The site features depths between 5 and 12 metres, averaging 8 metres, with mild currents. Visibility varies from 5 to 25 metres. Divers can observe wrasses, which are common, alongside uncommon species including golden butterflyfish, longfin bannerfish, blue-barred parrotfish, coral trout, pink skunk anemonefish, rock cod, rabbitfish, sergeants, hard coral, and snails. Entry is from the shore, though divers must navigate a shore break and watch for active boat traffic. Using a surface marker buoy is recommended for safety. The site is suitable for night diving, with water temperatures consistently ranging from 28C to 31C.

Red Rock is a pinnacle located 50 metres offshore in the Northwest Pinnacles of Thailand. The site features a reef, cave, and cavern system with depths ranging from 2 to 22 metres, averaging 10 metres. Divers can encounter Titan Triggerfish, Longfin Bannerfish, Pink Skunk Anemonefish, Sling-jaw Wrasse, Golden Butterflyfish, Blue-barred Parrotfish, and various wrasses. Less frequently, Blue Ringed Angelfish, Bluespotted Fantail Rays, Harlequin Sweetlips, Porcupinefish, Sixbanded Angelfish, Magnificent Giant Anemones, and White Eyed Morays are recorded. Access is by boat only. Conditions include mild currents and visibility between 5 and 25 metres. The site is suitable for beginners, with typical dives lasting 45 minutes.