Kolona, located off the coast of Attica, features a combination of natural and artificial reef structures. The site maintains a consistent depth of 20 metres, making it suitable for beginner divers. Visibility is excellent at 30 metres, and the absence of current allows for a relaxed pace during the typical 45-minute dive. The site is accessible via both shore and boat entry. Divers should remain vigilant regarding boat traffic, particularly when entering or exiting the water. Facilities at the site include parking, toilets, showers, changing rooms, and a rinse station. Night diving is permitted, offering a quieter alternative to daytime conditions.

Ancient Karthea features the remains of a sunken pier and dock dating back to the 6th century BC. Located in Attica, Greece, this site offers a unique opportunity to snorkel over massive stone blocks resting at depths of 2 to 3 metres. The site is suitable for beginners and provides visibility ranging from 15 to 30 metres. Entry is possible from both the shore and by boat. Conditions are generally mild, with water temperatures fluctuating between 16C in winter and 26C in August. A typical visit lasts approximately 45 minutes.

Avythou Beach in Attica, Greece, offers a diverse underwater landscape comprising reefs, caves, and caverns. Located in the south, the site is accessible by boat or 4x4 vehicle. The right side of the bay is particularly notable for its rocky crevices and small sea caves, which provide opportunities for exploration. Conditions at this site vary, with water temperatures ranging from 16C to 26C throughout the year. Divers should be aware of potential overhead environments and mild to strong currents. The site is suitable for intermediate divers and is also rated highly for snorkelling. Night diving is permitted at this location.

Kastellakia Coves in Attica, Greece, consists of three small, sheltered coves featuring shallow waters. This site is suitable for beginners and families looking to snorkel in a protected environment. The topography includes caves, with depths starting at one metre. Conditions are generally mild, with visibility reaching up to 30 metres. Water temperatures fluctuate throughout the year, ranging from 16C in the winter months to 26C in August. Access to the water is available via both shore and boat entries, making it a versatile location for those practising snorkel skills in a calm setting.

Koundouraki Reef is a diverse marine site located 400 metres off the coast of Attica, Greece. The topography features a reef structure that includes a drop-off, cave formations, and a wreck. The site is suitable for intermediate divers, with depths ranging from 1 to 40 metres and an average depth of 12 metres. Visibility typically spans 15 to 30 metres, with mild currents. Entry is possible from both shore and boat. The site is also well-suited for snorkelling. Divers should be aware of potential hazards, including boat traffic, deep sections, entanglement risks, and sharp coral. Guided tours and dive shop support are available for those exploring the area.

Koundouros reef in Attica, Greece, offers a diverse underwater landscape featuring a reef, a cave system, and a wreck. Located 400 metres from shore, the site reaches depths between 12 and 45 metres. Visibility typically ranges from 15 to 30 metres, with mild currents that can occasionally strengthen. The site is suitable for intermediate divers, though the cave and wreck are overhead environments requiring specific certification and equipment. Shore and boat entries are both available. The area supports a variety of Mediterranean reef fish and invertebrates. Divers should monitor conditions for potential down currents and thermoclines before descending.

Pisses Beach in Attica, Greece, features rocky outcrops at its northern end that provide shelter for marine life. This shore-entry site is suitable for beginners, with depths ranging from 2 to 10 metres and an average depth of 6 metres. Conditions vary, with visibility between 5 and 25 metres and mild currents. Water temperatures fluctuate from 16C in winter to 26C in August, though temperatures can drop to 12C in April. Facilities at the site include parking, toilets, showers, changing rooms, and a cafe. Divers should be aware of potential surf and sharp coral. Typical dives last approximately 45 minutes.

Kalidonixi Cove in Attica, Greece, is a sheltered marine site featuring a combination of reef structures and seagrass meadows. Accessible only by boat, the cove offers a shallow environment suitable for beginners, with depths ranging from 1 to 10 metres and an average depth of 5 metres. Snorkellers can expect mild currents and visibility typically between 10 and 20 metres. Water temperatures fluctuate throughout the year, ranging from 16C in the winter months to a peak of 26C in August. The site provides a calm setting for observing the underwater topography of the seagrass beds and reef formations.