Sailrock is a prominent pinnacle rising from the seabed, offering a diverse topography that includes a reef and a wall. Located 12 kilometres from shore, this site requires boat access and is suited for intermediate divers due to strong currents and depths ranging from 5 to 40 metres, with an average of 22 metres. Visibility varies significantly from 3 to 40 metres. Divers should be aware of potential hazards including boat traffic, surge, and thermoclines, which provide a refreshing shift in water temperature. The site features a variety of underwater structures suitable for a typical 60-minute dive. Facilities available nearby include equipment rental, air fills, and guided tours.

Sail Rock is a prominent granite pinnacle rising from the seabed near Koh Nang Yuan. This site features a vertical wall and reef topography, extending from 2 metres down to 40 metres with an average depth of 22 metres. Due to its offshore location, it is accessible only by boat. Divers should be prepared for strong currents and variable visibility ranging from 5 to 40 metres. Thermoclines are common, causing significant temperature fluctuations within the 28 to 31 degree Celsius range. Given the depth, potential for strong currents, and overhead environments, this site is suited for intermediate divers. Hazards include boat traffic, decompression risks, and sharp coral.

Shark Island is a surface-breaking pinnacle located 300 metres off the southern tip of Koh Tao. This site features a mix of reef, drift, and artificial reef topography, descending to a maximum depth of 28 metres with an average of 14 metres. Due to its location, the site experiences strong currents and variable visibility ranging from 3 to 30 metres. Divers and snorkellers may encounter wrasses, golden butterflyfish, and blue-barred parrotfish, alongside less frequent sightings of bluespotted fantail rays, titan triggerfish, and harlequin sweetlips. Access is by boat only. Hazards include strong currents, down currents, and sharp coral. Thermoclines can occasionally reduce water temperatures from the typical 28 to 31 degrees Celsius down to 24 to 25 degrees Celsius.

Southwest Pinnacle is a series of submerged rock formations located near Koh Nang Yuan. The site features a complex topography of pinnacles, reefs, and walls that descend from 5 metres to a maximum depth of 30 metres, with an average depth of 20 metres. Access is by boat only, as the site is situated over 7 kilometres from the shore. Divers should be prepared for moderate currents and potential surge, which can impact visibility. Due to the depth and current conditions, this site is recommended for advanced divers. Typical dive times are approximately 50 minutes. Facilities available include boat charter services and parking at the departure point.

Laem Thian is a diverse marine site featuring a combination of reef, cave, and drop-off topography. Located near Koh Nang Yuan, the site offers depths ranging from 5 to 24 metres with an average of 15 metres. Access is exclusively by boat. Divers and snorkellers should be prepared for moderate currents and potential surge, as well as deep water. Visibility at the site typically fluctuates between 10 and 30 metres. Water temperatures are consistent, ranging from 28 to 31 degrees Celsius throughout the year. Due to the prevailing conditions and depth, this site is best suited for intermediate-level divers.

Sai Daeng Beach is a shore-access reef site located on Koh Nang Yuan, Thailand. The site features a shallow average depth of 4 metres, ranging between 2 and 6 metres, making it suitable for beginners and snorkellers. Divers and snorkellers can observe a variety of marine life, including common sightings of Titan Triggerfish, wrasses, Longfin Bannerfish, Golden Butterflyfish, and Blue-barred Parrotfish. Uncommon species recorded here include Bluespotted Fantail Ray, Blue Ringed Angelfish, Pink Skunk Anemonefish, and Blacktip Grouper. The site offers visibility between 10 and 30 metres with mild currents, though users should remain aware of potential strong currents. Facilities include parking, toilets, equipment rental, and a cafe.

Hin Ngam, located off Koh Nang Yuan, features three distinct pinnacles set against a sandy seabed. This site offers a mix of coastal reef exploration and navigation between scattered pinnacles, with depths ranging from 5 to 18 metres. Divers and snorkellers frequently encounter Titan Triggerfish, wrasses, Longfin Bannerfish, Golden Butterflyfish, and Blue-barred Parrotfish. Other species present include Bluespotted Fantail Rays, Blue Ringed Angelfish, Harlequin Sweetlips, Scrawled Filefish, and Pink Skunk Anemonefish. Conditions are generally mild with visibility between 10 and 25 metres. Hazards include boat traffic, sharp coral, and the presence of triggerfish and stonefish. The site is accessible by boat or from the shore and is suitable for beginners.

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.