Two Columns is a marine dive site in Zakynthos, Greece, defined by two natural rock formations. The site features a mix of reef, wall, and cavern topography ranging from 16 to 30 metres in depth. Divers experience mild currents and visibility between 15 and 30 metres. The cavern sections create an overhead environment, requiring careful monitoring of air and no-decompression limits. Access is by boat only. Due to active boat traffic, divers should deploy a surface marker buoy upon ascent. A 5mm wetsuit is recommended for deeper dives, as temperatures can drop to 20°C at depths of 18 metres or more.

The Arch is a boat-access site off Zakynthos, Greece, featuring a diverse topography of reef, wall, cave, and cavern sections. Divers can explore depths ranging from 7 to 70 metres, with an average depth of 18 metres. Visibility typically spans 15 to 30 metres, and currents remain mild. A thermocline is often encountered below 25 metres, which can result in cooler water temperatures. Due to the presence of sharp coral and rock surfaces throughout the cave and cavern areas, buoyancy control is essential to avoid contact. This site is suited for intermediate divers who can manage depth profiles and navigate varied underwater structures.

Little Big Rock off Zante Island, Greece, offers a varied underwater landscape featuring reef, wall, and cavern terrain. Divers can explore depths ranging from 12 to 40 metres, with an average depth of 25 metres. Visibility typically spans 15 to 30 metres. The site is accessible only by boat and is suited for intermediate divers due to the potential for surge and swell, which can push divers toward the structure. Maintain active buoyancy to avoid contact with sharp reef and cavern surfaces. A mild current is common, and morning dives are recommended as conditions are generally calmer during the early part of the day.

Keri Caves in Zakynthos, Greece, offers a diverse underwater topography consisting of caves, caverns, reefs, and walls. This site is accessible only by boat and is suited for intermediate divers due to the overhead environment and depths ranging from 8 to 30 metres, with an average of 18 metres. Visibility typically spans 15 to 30 metres, though conditions vary. Water temperatures fluctuate between 16C and 23C, with summer peaks reaching up to 28C, necessitating appropriate thermal protection outside of peak season. Divers should be aware of potential hazards including boat traffic, cold water, and the overhead environment. Species recorded around this area include loggerhead sea turtles, dusky groupers, and various wrasses.

Elephant Reef, located off Zante Island, offers a diverse underwater profile that transitions from a reef into a wall and cavern system. Designed for intermediate divers, the site reaches depths between 18 and 30 metres. Visibility typically ranges from 15 to 30 metres, supported by mild currents. Boat access is required to reach the site, which is suitable for year-round diving. Morning departures are recommended for optimal light penetration within the cavern sections. Species recorded around this area include loggerhead sea turtles, Indian lionfish, dusky grouper, common octopus, Mediterranean moray, Turkish wrasse, European parrotfish, kingfish, rock cod, rabbitfish, white seabream, fireworms, and castagnole.

Little Bay in Zakynthos, Greece, offers a combination of reef and cavern topography suitable for beginner divers. The site features depths ranging from 12 to 20 metres, with an average depth of 16 metres. Divers can expect visibility between 10 and 30 metres, with minimal current, allowing for a controlled exploration of the underwater structures. Access to this site is exclusively by boat, requiring coordination with local dive centres. Water temperatures fluctuate throughout the year, ranging from 16C in the cooler months to 25C in September. Hazards at this location include the presence of jellyfish and sharp coral formations.

Butterfly Cave in Zakynthos, Greece, is a cavern and cave system featuring depths between 10 and 18 metres. This boat-access site offers visibility ranging from 15 to 30 metres, with mild currents suitable for intermediate divers. The topography includes a cavern entrance and an adjacent reef structure. Divers should be aware of overhead environments and potential entanglement hazards. Species recorded around this area include loggerhead sea turtles, Indian lionfish, common octopus, dusky grouper, and various wrasses. Mid-morning dives are recommended to take advantage of natural light entering the cavern, though carrying a dive light is necessary to explore shadowed pockets within the system.

White Reef, located off Zante Island in the Ionian Sea, features a combination of reef topography and a cave system. The site ranges in depth from 6 to 30 metres, providing a range of depths suitable for different experience levels. Visibility is generally good, typically between 18 and 30 metres. Access to this site is exclusively by boat. The cave is an overhead environment where direct ascent to the surface is not possible; beginners should only enter this area under the supervision of a qualified guide. Facilities are minimal at the site, so divers should confirm equipment and boat arrangements with a local dive centre in advance.