Ang Thong Marine Park in the Gulf of Thailand offers a diverse underwater environment featuring reefs, caves, and drift diving opportunities. Located 30 kilometres from the shore, the site requires boat access. Divers and snorkellers can explore depths ranging from 1 to 25 metres, with an average depth of 10 metres. Conditions are generally suitable for beginners, with mild currents and visibility fluctuating between 5 and 30 metres. Water temperatures remain warm throughout the year, typically between 28 and 31 degrees Celsius. Hazards to consider include boat traffic, variable visibility, and surf. Typical dives last approximately 60 minutes.

Ko Wao is a reef dive site in Ang Thong Marine Park, Thailand, accessible by boat from Koh Samui. The site features depths ranging from 5 to 30 metres, with an average depth of 13 metres, making it suitable for beginners who can explore the shallower sections. Conditions include mild currents and visibility between 5 and 25 metres. Water temperatures typically range from 28 to 31 degrees Celsius. The site supports a variety of reef fish and invertebrates. Divers should be aware of potential surge and jellyfish. Night diving is available at this location, and guided tours are recommended for those visiting for the first time.

Koh Yippon in Ang Thong Marine Park offers a diverse underwater environment featuring reef, cave, and wall topography. The site is notable for a swim-through that passes directly through the island. Depths range from 1m to 30m, with an average of 10m, making it suitable for beginners. Access is exclusively by boat, and conditions include mild currents and visibility ranging from 3m to 20m. Water temperatures remain warm, typically between 28C and 31C. Divers and snorkellers should be aware of potential hazards including boat traffic, sharp coral, and variable visibility. Guided tours and boat charters are available for those visiting from Koh Samui.

Shark Point is a reef and pinnacle site located 26 kilometres from Koh Tao. This offshore location is suitable for intermediate divers and requires boat access. The site features a depth range of 5 to 30 metres, with an average depth of 20 metres. Divers should be prepared for moderate currents and potential surf conditions. Visibility at the site varies significantly, ranging from 5 to 25 metres. Due to the open water location, boat traffic is a hazard to consider during dives. Typical dive times at this pinnacle are approximately 45 minutes. Water temperatures remain warm throughout the year, fluctuating between 28C and 31C.

Koh Kong Kliang is a reef site located within Ang Thong Marine Park, offering depths between 6 and 14 metres with an average of 9 metres. This site is suitable for beginners and is accessible by boat only. The environment features mild currents and water temperatures ranging from 28 to 31C. Visibility is approximately 3 metres, requiring divers and snorkellers to move slowly and maintain awareness of the reef structure. Sharp coral and rock edges are present, so maintain a safe distance from the substrate to avoid injury. Night diving is permitted, and morning visits are recommended to maximise visibility before the water conditions change.

Koh Te Nok in Ang Thong Marine Park features a combination of reef and pinnacle topography. The site ranges from a shallow reef at 5 metres to a maximum depth of 30 metres, with an average depth of 15 metres. Divers encounter mild currents and visibility between 5 and 25 metres. Boat access is required, and divers should be aware of surge near the pinnacle and at the surface. Species recorded around this area include wrasses, porcupinefish, groupers, and various butterflyfish. The site is suitable for beginner divers, with typical dive times of 60 minutes in warm water temperatures ranging from 28 to 31 degrees Celsius.

Shark Island in Ang Thong Marine Park offers a straightforward reef dive suitable for beginners and those building underwater confidence. The site features shallow, calm waters with temperatures typically ranging between 28C and 31C throughout the year. Access is by boat, and divers should consult their operator regarding current strength and visibility, as these conditions vary. The reef environment supports a variety of reef fish and invertebrates characteristic of the Gulf of Thailand. Early morning visits often provide calmer surface conditions and improved light for exploring the reef structure.

Koh Tae Nai in Ang Thong Marine Park offers a combination of natural reef and artificial reef structures. Suitable for beginners, the site features shallow depths ranging from 2 to 7 metres with an average of 5 metres. Access is by boat, located 400 metres from shore. Divers and snorkellers can expect mild currents and visibility between 10 and 30 metres. The site is best visited in the morning to avoid afternoon wind chop. Hazards include sharp coral and potential jellyfish; always check with the boat crew regarding current conditions before entering the water.