Troulos Reef is a marine site located 9 km from Skiathos Town, Greece, featuring a combination of reef and cave topography. The site is accessible only by boat and is suitable for intermediate divers. The depth ranges from 5 m to 20 m, with an average depth of 10 m. Divers can expect mild currents and visibility ranging between 10 m and 30 m. Typical dives last approximately 40 minutes, and the site is available for night diving. Facilities including air fills, equipment rental, showers, and rinse stations are available. Hazards at this location include boat traffic and local marine life.

Koutseri (Diamanti) is a reef and artificial reef site in Greece featuring diverse rock formations. The dive begins at a depth of 4 metres and reaches a maximum depth of 20 metres. Conditions are generally stable with mild currents and visibility ranging between 25 and 30 metres. This site is suitable for beginners and requires boat access. Water temperatures fluctuate throughout the year, ranging from 15C in the winter months to 26C in August. Divers should be aware of sharp coral present at the site. Facilities available nearby include parking, toilets, showers, changing rooms, a rinse station, air fills, equipment rental, and guided tours.

Kanapitsa is a reef and wall site located in a gulf south of Panormos Beach. The site features a rocky seabed starting at 5 metres, with an underwater rock formation leading to a wall that drops to 30 metres. Divers and snorkellers can expect an average depth of 18 metres. Access is by boat only, and the site is suitable for beginners. Conditions include mild currents, though strong currents can occur. Visibility ranges from 10 to 30 metres, and water temperatures fluctuate between 15C and 24C throughout the year. Night diving is permitted at this location, with typical dives lasting 40 minutes.

Tsougriaki is a shallow reef site located 400 metres from the shore in Greece. The site maintains a consistent depth of 4 metres, making it suitable for beginners and snorkellers. Access is by boat only, with typical dives lasting around 50 minutes. Conditions are generally mild, with visibility ranging from 10 to 30 metres. Water temperatures fluctuate throughout the year, reaching a high of 27C in August and a low of 15C during the winter months. Divers and snorkellers should be aware of sea urchins present in the area.

The Aquarium is a reef site located 5000 metres offshore, requiring boat access. The topography features a reef stretching 30 to 40 metres, with depths ranging from 4 to 40 metres. Conditions are generally stable with mild currents and visibility between 10 and 30 metres. Water temperatures fluctuate between 15C and 21C throughout the year. The site is suitable for beginners and supports night diving. Divers should be aware of the presence of lionfish and sea urchins in the area. Facilities available at the supporting dive shop include parking, toilets, showers, changing rooms, air fills, and guided tours.

Repio island offers a diverse underwater landscape featuring a wall, reef, and cavern system. Divers can explore rocky formations ranging from 5 to 40 metres, with an average depth of 18 metres. The site is located near an uninhabited islet east of Skiathos Island, which is marked by a lighthouse built in 1914. Access to this site is by boat only. Conditions are generally stable with mild currents and visibility between 15 and 30 metres. Water temperatures fluctuate between 14C and 20C throughout the year. Due to the depth and potential for boat traffic, this site is best suited for intermediate divers.

Triton Caverns in Greece features two distinct caverns and a dramatic wall topography. One cavern is a tunnel with natural light windows, while the second features an entrance at 6m, penetrating to 15m. Divers navigate along walls and through boulder fields, reaching a large cavern at the end of the dive. Depths range from 6m to 25m, with an average of 12m. Conditions include mild currents and visibility between 10m and 30m. This site requires boat access and is suited for intermediate divers. The habitat supports a variety of Mediterranean reef fish and invertebrates. Hazards include boat traffic and depth.

Agios Georgios Wall is a vertical drop-off that descends from 6 metres to 40 metres, featuring a reef structure and a prominent pinnacle. Located 5500 metres from shore, this site requires boat access and is suited for advanced divers due to the depth and potential for current shifts. Visibility typically ranges between 20 and 30 metres, allowing for clear observation of the wall profile. Divers should monitor their depth closely and use a delayed surface marker buoy to mitigate risks from overhead boat traffic. The site is best visited in the morning to avoid the busiest periods of recreational vessel activity.