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.

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.

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.

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.

Chumphon Pinnacle is a granite pinnacle located 25 kilometres from shore in the Northwest Pinnacles area of Thailand. The site features large granite blocks forming a small hill, including a sheer crack that allows for a swim-through. Depths range from 5 to 40 metres, with an average depth of 20 metres. This site is suitable for intermediate divers and is accessed by boat. Conditions vary, with visibility ranging from 2 to 30 metres and moderate currents. Hazards include deep water, potential entanglement, jellyfish, low visibility, overhead environments, sharp coral, strong currents, and thermoclines. Typical dive times are approximately 50 minutes.

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.

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.

White Rock is a reef and pinnacle site located 2000 metres from the shore of Koh Nang Yuan. The site features a depth range of 1 to 28 metres, with an average depth of 15 metres. Divers can expect mild currents and visibility ranging from 10 to 25 metres. Marine life commonly encountered includes Blue Ringed Angelfish, Titan Triggerfish, Bluespotted Fantail Ray, wrasses, Rock Cod, Blue-barred Parrotfish, Blacktip Grouper, Pink Skunk Anemonefish, Sling-jaw Wrasse, Golden Butterflyfish, and Longfin Bannerfish. Harlequin Sweetlips, porcupinefish, and groupers are also present. The site is suitable for beginners and supports night diving. Boat access is required, and divers should be aware of boat traffic, sharp coral, and triggerfish.