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.

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.

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.

Agios Romanos is a reef site located on the southern coast of Tinos Island. The site is accessible via a shore entry and is suitable for intermediate divers. Underwater, the topography consists of rocky edges and a small pier, with depths ranging between 20 and 30 metres. Visibility at the site typically spans 15 to 30 metres, with mild currents present. Divers should be aware of decompression and nitrogen narcosis as potential hazards. Facilities available at the location include parking and showers. The site is also suitable for snorkelling, particularly around the pier and the rocky margins of the bay.

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.

Vathi Beach is a deep, narrow cove in the Cyclades, Greece, characterised by steep underwater drop-offs and rocky walls. The site offers a varied underwater landscape suitable for intermediate divers, with depths ranging from 8 to 18 metres and an average depth of 15 metres. Shore access is available, and conditions typically feature mild currents with visibility between 10 and 25 metres. Water temperatures fluctuate throughout the year, ranging from 16C in late winter to 24C in late summer. Divers should be aware of sharp coral present at the site. The location is also well-regarded for snorkelling, holding a rating of 4 out of 5.

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.

Blue Lagoon is a reef and cave site located west of Mykonos near Delos. Accessible only by boat, the site features sandy-bottomed reefs and caves at depths ranging from 5 to 16 metres, with an average depth of 9 metres. Visibility varies between 15 and 50 metres, and currents are generally mild. The site is suitable for beginners and offers excellent conditions for snorkelling. Divers should be aware of overhead environments within the caves, as well as the presence of sea urchins and sharp coral. Facilities including air fills, equipment rental, guided tours, and boat charters are available for visitors.