Lighthouse Bay is a sheltered site located at Koh Nang Yuan, named for the lighthouse situated on the headland. The topography consists of a reef and pinnacle system featuring various coral formations. Depths range from 3 to 14 metres, with an average depth of 8 metres. Conditions are generally mild, though visibility can fluctuate between 5 and 30 metres. The site is accessible by both shore and boat, making it suitable for beginners and those seeking to practice underwater photography. Water temperatures remain warm throughout the year, ranging from 28C to 31C. Hazards include potential low visibility, sharp coral, and surf. Guided tours are available for this location.

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.

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.

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.

Northwest Pinnacles at Koh Nang Yuan features a diverse topography of reefs, pinnacles, and caves. The site is accessible by boat and is suitable for beginners, with depths ranging from 2 to 30 metres and an average depth of 8 metres. Conditions are generally mild, though divers should be aware of potential boat traffic, rip currents, and surf. Visibility varies significantly from 2 to 30 metres, and water temperatures remain warm between 28 and 31 degrees Celsius. The site supports night diving and offers a 50-minute typical dive duration. Facilities including equipment rental, air fills, and guided tours are available on the island.

Twin Peaks is a reef site located at Koh Nang Yuan, Thailand, offering a shallow dive experience suitable for beginners. The site features depths ranging from 5 to 20 metres, with an average depth of 10 metres. Divers can access the reef directly from the shore. Conditions are generally mild, with visibility fluctuating between 5 and 20 metres. Marine life is diverse, with common sightings including Blue Ringed Angelfish, Bluespotted Fantail Ray, Titan Triggerfish, and various wrasses. Other frequent inhabitants include groupers, Blacktip Grouper, Blue-barred Parrotfish, Longfin Bannerfish, Golden Butterflyfish, Sling-jaw Wrasse, and Pink Skunk Anemonefish. Harlequin Sweetlips and porcupinefish are also recorded here.

Boyancy, also known as Buoyancy World, is an artificial reef project situated off the west coast of Koh Nang Yuan near Koh Tao. This site features a series of structures designed to support reef development and provide buoyancy training opportunities. Divers can explore the area at depths ranging from 5 to 20 metres, with an average depth of 10 metres. Access is by boat only, and the site is suitable for beginners. Conditions generally feature mild currents and visibility between 5 and 25 metres. Hazards include boat traffic, jellyfish, sea urchins, sharp coral, stonefish, and triggerfish. The site is supported by local facilities offering air fills, equipment rental, and guided tours.

Green Rock is a pinnacle dive site located near Koh Nang Yuan, offering a varied underwater topography that includes swim-throughs and an overhead environment. The site is suitable for intermediate divers, with depths ranging from 5 to 30 metres and an average depth of 20 metres. Access is by boat only, and divers should be prepared for moderate currents and visibility that can fluctuate between 5 and 20 metres. The site supports night diving and is typically explored in 30-minute dives. Due to the presence of deep sections, overhead structures, and potential currents, divers should maintain appropriate caution during their visit.