Prasonisi is a diverse reef site in the Cyclades, featuring a combination of wall, cave, and cavern topography alongside areas of seagrass. Located 7000 metres from shore, this site requires boat access. Divers can expect depths ranging from 12 to 30 metres, with an average depth of 18 metres. Conditions are generally mild with visibility reaching 30 to 40 metres. The site includes overhead environments within its cave and cavern structures, requiring appropriate training. Water temperatures fluctuate between 16C and 22C throughout the year. Typical dives last approximately 45 minutes, and the site is suitable for intermediate divers. Night diving is also available at this location.

Platis Gialos Reef is a shore-entry site located in the Cyclades, Greece, offering a shallow reef environment suitable for beginners. The site features a submerged reef in the centre of the bay, flanked by 400 metres of rock-carved terrain along the eastern and western headlands. Depths range from 1 to 10 metres, with an average of 5 metres. Conditions vary, with visibility ranging between 5 and 25 metres and mild currents. Facilities at the site include parking, toilets, showers, changing rooms, a cafe, and a dive shop. Divers and snorkellers should be aware of jellyfish and sea urchins in the area.

Houlakia Beach is a protected natural monument in the Cyclades, Greece, characterised by a unique pebbled shoreline. The underwater topography features large boulders that create a dramatic landscape with gaps between the stones. Divers can explore this reef environment at depths ranging from 5 to 15 metres, with an average depth of 10 metres. Entry is via the shore, and conditions generally feature mild currents and visibility between 15 and 25 metres. The site is suitable for intermediate divers. Hazards include potential entanglement, sea urchins, and surf. Facilities available at the beach include parking, a cafe, and toilets.

Agios Sostis on Tinos Island features a combination of natural reef and artificial structures, including a pier and a small peninsula. This site is suitable for beginners, offering shallow depths ranging from 1 to 8 metres with an average of 4 metres. Divers and snorkellers can expect mild currents and visibility between 5 and 15 metres. Water temperatures fluctuate seasonally, reaching a high of 25C in August and a low of 16C in February and March. Shore access is available, and the site provides facilities including a cafe, showers, and changing rooms. Typical dives last approximately 45 minutes.

Pachia Ammos on Tinos Island is a shore-entry snorkel site defined by its golden sand dunes and rocky zones located on both flanks of the beach. The site is suitable for beginners, offering depths ranging from 1 to 10 metres with an average depth of 4 metres. Conditions are generally mild, with visibility varying between 5 and 20 metres. Water temperatures fluctuate throughout the year, ranging from 16C in the cooler months to 25C in August. The swimming season in Tinos typically spans from June to November, providing the most comfortable conditions for snorkelling.

Lychnaftia is a reef site located on Tinos Island, characterised by a beach of black and white pebbles. The southern end of the site features rocky formations that create varied underwater topography. Access is via the shore, and the site is suitable for intermediate divers and snorkellers. Conditions include mild currents and water temperatures ranging from 16°C to 25°C throughout the year. The swimming season typically spans June to November, when water temperatures remain at or above 20°C. Divers and snorkellers should be aware of the presence of jellyfish and sea urchins in the area.

Agia Anna Beach is a sheltered bay in the Cyclades, Greece, offering a shallow environment suitable for both diving and snorkelling. The site features a mix of reef and wall topography with an average depth of 3 metres, ranging from 1 to 4 metres. Entry is via the shore, and conditions are generally mild with visibility between 5 and 15 metres. The site is well-suited for beginners and families, supported by facilities including parking, showers, changing rooms, toilets, and a cafe. Divers and snorkellers should remain aware of boat traffic in the area and the presence of sea urchins on the seabed.

Mersini Beach in the Cyclades is a shore-entry reef site suitable for beginners. The area features a sandy seabed and depths ranging from 1 to 10 metres, with an average depth of 5 metres. Snorkellers can expect mild currents and visibility between 5 and 15 metres. The habitat supports a variety of Mediterranean reef fish and invertebrates typical of the region. Visitors should be aware of sea urchins and potential surf conditions when entering the water. This location offers a quiet environment for snorkelling, with water temperatures fluctuating between 16C and 25C throughout the year.