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.

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.

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.

Xyla Beach in Attica, Greece, features a secluded cove located south of the main beach. This reef site offers varied underwater topography with depths ranging from 2 to 30 metres, averaging 22 metres. Access is via a shore entry, and the site is suitable for intermediate snorkelers and divers. Conditions are variable, with visibility ranging from 5 to 30 metres and mild currents. Divers should be aware of potential surf conditions at this location. Parking is available for visitors. A typical dive session lasts approximately 60 minutes.

Ksyla Bay, located off Kea Island in Attica, features a combined reef and wall topography. The site reaches depths between 20 and 30 metres, with an average depth of 22 metres. Visibility is consistently 30 metres, providing clear sightlines along the wall face and reef structure. This site is suitable for advanced divers due to the depth. Access is by boat only, and guided tours are available through local dive shops. Divers should monitor their depth gauge and gas supply closely, as the wall reaches 30 metres. The site operates year-round with no notable current, allowing for controlled exploration of the two distinct environments.

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.

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.

Marades is a wreck dive site in Attica, Greece, featuring the remains of a small cargo ship approximately 30 metres in length. Resting at a consistent depth of 10 metres, this site is suitable for beginners and serves as an accessible dive. Access is by boat only. Divers should be aware of potential entanglement hazards within the wreck structure. Visibility at the site ranges from 5 to 20 metres, with mild currents typically present. Water temperatures fluctuate throughout the year, ranging from 16C in the winter months to 26C in August. A typical dive at this location lasts around 40 minutes.