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.

Samran Pinnacle is a deep-water reef structure located 7500 metres from Koh Nang Yuan. The site consists of a submerged pinnacle with depths ranging from 9 to 30 metres, averaging 25 metres. Due to the exposed location, divers must contend with strong currents, making this an advanced dive site. Access is exclusively by boat. Visibility at the pinnacle is variable, typically ranging between 5 and 25 metres. The site supports night diving, with typical dives lasting around 50 minutes. Given the depth and current conditions, this site is suited for experienced divers capable of managing open-water currents.

Construction Artificial Reef in Ang Thong Marine Park is a structured site composed of construction materials. It is suitable for beginner divers, with depths ranging from 8 to 18 metres and an average depth of 13 metres. The site features mild currents and visibility between 5 and 25 metres. Divers should be aware of sharp edges on the structure and potential entanglement hazards. Boat access is required, and the use of a surface marker buoy is recommended due to boat traffic. Species recorded around this area include wrasses, butterflyfish, groupers, and anemonefish. Water temperatures remain warm throughout the year, typically between 28 and 31 degrees Celsius.

Kong Yai is a reef and pinnacle site located within Ang Thong Marine Park. Accessible only by boat from Koh Samui, the site features depths ranging from 10 to 20 metres, with an average of 14 metres. Conditions are generally manageable with mild currents, though currents can strengthen unexpectedly around the pinnacle. Visibility typically ranges between 5 and 10 metres. Due to the variable visibility, divers should remain close to their guide and use the reef structure as a reference point. The site is suitable for beginners and supports night diving. Species recorded around this area include wrasses, groupers, butterflyfish, and various reef-associated fish and invertebrates.

Koh Ma in Ang Thong Marine Park features a shelving coral reef that transitions from shallow depths to black and soft corals. Divers and snorkellers can explore this site at depths ranging from 5 to 25 metres, with an average of 12 metres. The reef supports a variety of marine life, including wrasses, groupers, Copperband Butterflyfish, Golden Butterflyfish, Blacktip Grouper, and Blue-barred Parrotfish. Less frequently, visitors may encounter Blue Ringed Angelfish, Harlequin Sweetlips, Pink Skunk Anemonefish, Longfin Bannerfish, Magnificent Giant Anemone, Rock Cod, Eightband Butterflyfish, and Porcupinefish. The site is suitable for beginners, offering mild currents and visibility between 10 and 25 metres. Entry is possible by both boat and shore.

Khom Beach in Ang Thong Marine Park offers a straightforward shore dive suitable for beginners. The site features a reef composed of hard and soft corals at depths ranging from 2 to 11 metres, with an average of 6 metres. Divers experience mild currents and visibility between 3 and 10 metres. Due to the presence of sharp coral and rocks, care is required during entry and exit. Titan triggerfish may be encountered and can be territorial, so maintain a respectful distance. Species recorded around this area include various butterflyfish, wrasses, groupers, and anemonefish. A cafe is available on-site for post-dive refreshments.

Mae Haad is a reef site located in Ang Thong Marine Park, suitable for both diving and snorkelling. The site features depths ranging from 8 to 20 metres, with an average of 14 metres. Conditions include mild currents and visibility that varies between 5 and 30 metres. Access is available via shore or boat. Divers should be cautious of sharp coral and rocks, as well as sea urchins hidden in crevices. Jellyfish are also present, making a full rash guard or thin wetsuit advisable. On-site facilities include a dive shop, equipment rental, and air fills. Night diving is available for those interested in exploring the reef after dark.

The Dive Inn in Ang Thong Marine Park offers a combination of reef and pinnacle topography. Accessible only by boat, the site features depths ranging from 5 to 30 metres, with an average of 15 metres suitable for beginner divers. Visibility varies between 5 and 25 metres, and water temperatures remain warm between 28 and 31C. Divers should be aware of moderate currents, which can run strong near the pinnacle. Guided tours are recommended to navigate these conditions effectively. Night diving is available at this location. Species recorded around this area include wrasses, groupers, rock cod, and various butterflyfish species.