Marathonisi Caves, located on the southern side of the uninhabited Marathonisi island in Zakynthos, Greece, feature a combination of caves, reefs, and canyons. This site is primarily accessed by boat and is well-suited for intermediate snorkelers. Depths range from 2 to 10 metres, with an average of 5 metres. Visibility typically spans 10 to 25 metres, though visitors should remain aware of boat traffic, the overhead environment, and sea urchins. Species recorded around this area include loggerhead sea turtles, Indian lionfish, dusky grouper, Mediterranean moray, common octopus, Turkish wrasse, European parrotfish, kingfish, rock cod, white seabream, bream, fireworms, and castagnole.

Marathonissi is a diverse marine site located 4000 metres from the shore of Zakynthos, Greece. The topography features a combination of reef sections, a cave, and a canyon, providing varied environments within a single dive. Depths range from 12 to 18 metres, with an average of 15 metres, making it suitable for beginner divers. Visibility is consistently 30 metres, and there is typically no current. Access is by boat only, and divers must remain vigilant regarding boat traffic. It is recommended to use a delayed surface marker buoy during ascent and to coordinate trips through a local dive centre to manage safety and logistics.

Marathonisi, located off Zante Island, features a diverse underwater landscape of reefs, canyons, and caves. With depths ranging from 0 to 18 metres and an average of 10 metres, the site is well-suited for beginners. Visibility is excellent, typically between 20 and 30 metres, supported by mild currents. Access is strictly by boat, and divers should remain vigilant regarding boat traffic, particularly during the summer season. Species recorded around this area include loggerhead sea turtles, Indian lionfish, dusky grouper, common octopus, Mediterranean moray, European parrotfish, and various species of wrasse and bream.

Alati in Zakynthos, Greece, offers a diverse underwater landscape featuring a combination of reef, wall, and seagrass habitats. This shore-entry site is suitable for beginners, with depths ranging from 3 to 40 metres and an average depth of 15 metres. Divers can expect mild currents and visibility between 15 and 30 metres. The site is accessible for night diving, with typical dives lasting 45 minutes. Species recorded around this area include Loggerhead Sea Turtle, Indian Lionfish, Common Octopus, Dusky Grouper, Mediterranean Moray, Turkish Wrasse, European Parrotfish, various wrasses, Kingfish, Rock Cod, Bream, Tube Worm, Madeira Rockfish, and Painted Comber. Facilities at the site include parking, a cafe, and changing rooms.

Poseidon Cave in Zakynthos, Greece, offers a varied underwater landscape featuring cave, cavern, reef, and wall topography. Divers typically explore at depths between 18 and 22 metres, with visibility ranging from 15 to 30 metres. Access to this site is by boat only. Conditions include mild currents, though divers should be prepared for an overhead environment, potential low visibility, and entanglement hazards. The site is suited for intermediate divers. Species recorded around this area include loggerhead sea turtles, Indian lionfish, dusky grouper, common octopus, Mediterranean moray, European parrotfish, Turkish wrasse, kingfish, wrasses, rock cod, bream, rabbitfish, Madeira rockfish, and fireworms.

Octopus Reef, located off Zante Island, features a diverse underwater topography consisting of a reef, a wall, and a cavern. The site offers depths ranging from 6 to 50 metres, with an average depth of 16 metres. Divers experience mild currents and visibility between 10 and 30 metres. Access is strictly by boat. Due to the presence of a cavern, local guidance is recommended for navigation. Divers must be aware of potential hazards including jellyfish, lionfish, sea urchins, sharp coral, and stonefish. Proper buoyancy control is essential to avoid contact with the seabed and rocky surfaces. An Advanced Open Water certification is required in addition to Open Water certification to dive here.

Marathia in Zakynthos, Greece, offers a combination of wall and reef topography suitable for beginner divers. The site features an average depth of 10 metres, with a total depth range extending from 9 to 20 metres. Access to this location is exclusively by boat. Divers can expect visibility ranging between 10 and 30 metres. Water temperatures fluctuate throughout the year, reaching up to 25°C in September, though a thermocline may be present at depths of 18 metres or more where temperatures can drop to 20°C. Typical dives at this site last approximately 50 minutes.

Barracuda Reef in Zakynthos, Greece, features a diverse topography comprising a reef, a pinnacle, and a cave. Accessible only by boat, the site ranges from 14 to 40 metres in depth, with an average of 20 metres. Visibility typically spans 15 to 30 metres. Divers should be aware of moderate currents that can increase unexpectedly, requiring close proximity to guides and the use of surface marker buoys to manage boat traffic. While suitable for beginners, divers must monitor their depth carefully as the site extends beyond standard open water limits. Species recorded around this area include loggerhead sea turtles, Indian lionfish, dusky grouper, common octopus, and Mediterranean moray.