Top 10 Dive Sites in Greece
Greece spent decades restricting scuba diving because of concerns about undeclared archaeological finds — a law dating from 1967 that effectively banned recreational diving outside of designated zones. Reforms in the 2000s and progressive expansion of approved dive areas have transformed the Greek underwater scene, and the country now has a growing network of dive centres, many operating in island settings with direct access to some of the clearest water in the Mediterranean. Water temperatures range from 14°C in the northern Aegean in February to 28°C in the southern Ionian in August. Visibility is frequently exceptional — 25–35 metres is common — because the Mediterranean is nutrient-poor and algae growth is limited. The marine life runs to grouper, moray eels, sea bream, octopus, and the occasional loggerhead turtle.
1. Santorini, Cyclades
The flooded caldera at Santorini is one of the most unusual dive environments in the world. Volcanic hot springs at Nea Kameni island produce warm, minerally-charged water at certain points of the caldera rim, and the wall dives on the outer flanks of the island drop through exceptional visibility to 30–40 metres on a substrate of volcanic rock colonised by large sponges and fan corals. The combination of geological drama and good marine life makes this one of Greece's most memorable dives. Water temperature in summer: 24–26°C. Dive centres in Oia and Fira offer daily boat departures from May through October.
2. Chios, North Aegean
The waters around Chios are less visited than the Cyclades or Dodecanese, which shows in the quality of the marine life. The island's rocky coastline drops steeply in many places, creating walls at 15–40 metres that carry significant growths of gorgonian fans and deep-water corals. Grouper of substantial size are present throughout, and the crevices of the deeper rock faces shelter large moray eels. Visibility averages 20–30 metres and is at its best in September and October after the summer calm has settled the water. Local dive operators run small-group trips that visit sites not marked on standard charts.
3. Zakynthos, Ionian Islands
Zakynthos is celebrated above water for its nesting beaches of loggerhead turtles, and those same turtles are a reliable presence in the water around the island, particularly at shallow dive sites on the eastern and northern coasts. The marine protected area around the Gulf of Laganas, established to protect the nesting beaches, has also created a zone where fish populations are notably denser than in unprotected areas nearby. Dive sites range from 8 to 25 metres, largely suitable for Open Water divers. Water temperature: 20–26°C from May to November. Several local operators run night dives specifically for turtle encounters.
4. Lygaria, Crete
On the northern coast of Crete near Rethymno, Lygaria is a sheltered bay with a variety of entry points giving access to rocky reef slopes at 5–25 metres. The site is well-suited to training dives and Open Water qualification dives, but the marine life — particularly the octopus, nudibranch, and cephalopod populations — makes it rewarding for more experienced photographers willing to slow down on a shallow dive. The combination of easy access, consistent conditions, and good visibility (typically 15–20 metres in summer) has made it a base for several dive centres serving the Rethymno resort area.
5. Mononaftis, Crete
The name means 'single sailor' in Greek, a reference to the isolated nature of the dive site. Located on the wild northern coast east of Heraklion, Mononaftis is a deeper wall site descending to around 40 metres with gorgonian growth beginning at 20 metres and increasing with depth. Significant schools of bream and occasional large amberjack pass the wall on their way along the coast. The site is accessible only in calm conditions because the coast faces the northerly Meltemi wind that scours the Aegean in July and August. Best windows: May to June and September to October.
6. Caique Wreck, Corfu
The shallow waters around Corfu contain several wrecks of caiques — the traditional wooden cargo boats of the Greek islands — and a few small steel vessels sunk deliberately or lost to weather. The most accessible lies at around 18–22 metres on a sandy bottom and is encrusted with cup corals, tunicates, and the colourful encrusting sponges that colonise slower-decay Mediterranean wrecks. Octopus and conger eels have made permanent homes in the hull. Open Water divers can access this site comfortably. Visibility is 10–20 metres depending on season, with the best conditions in May and October.
7. St. George Cave, Athens Riviera
South of Athens on the Attica coast, St. George Cave is an accessible cave system with an air pocket at the back — the cave roof emerges above water, which means it can be entered without overhead environment training. The walls of the approach tunnel carry encrusting sponges and tube worms, and the light effects as the tunnel opens to the air pocket are photographically striking. The site is at 5–12 metres and suits Open Water divers. The Athens Riviera coast has a surprising number of dive sites within day-trip range of the capital, including several small wrecks.
8. Lefkada, Ionian Islands
The channel between Lefkada and the mainland of Akarnania is navigated by the island's famous swing bridge, but the open sea on the west coast offers entirely different conditions — exposed walls dropping into the Ionian, with visibility of 25–30 metres and occasional encounters with large grouper and dentex. The sheltered eastern shore provides easier conditions for Open Water training and discovery dives. Dive centres in Nydri on the eastern coast make the western wall sites accessible in settled weather. Water temperature: 18–26°C from April to November.
9. Kefalonia, Ionian Islands
The deep, narrow Kefalonia Trench lies offshore — the Ionian off Kefalonia is among the deepest water in the Mediterranean — but the recreational diving is concentrated on the island's limestone cave systems and the shallow reefs of Fiskardo in the north. Melissani Cave is a famous tourist attraction from above, but several submerged caves around the island offer genuine cave diving experiences accessible from the sea. Loggerhead turtles are frequent companions on the reef dives, and the clear Ionian water regularly exceeds 30 metres visibility in the summer months.
10. Rhodes, Dodecanese
Rhodes sits at the eastern edge of the Aegean and benefits from a meeting of currents that brings nutrient-rich water up from depth at certain points on the island's coast. The southern tip at Prasonisi is a windswept headland where the Aegean meets the Mediterranean, creating conditions that most divers avoid but serious drift-dive enthusiasts seek out. The calmer sites on the east coast near Kalithea have excellent visibility and support an accessible reef dive at 10–25 metres with good populations of sea horses, blennies, and Mediterranean moray eels. Several internationally recognised dive centres operate from the main town and Lindos.
Planning your Greek dive trip
The main dive season runs from May to October. July and August offer the warmest water but also the strongest Meltemi winds in the Aegean, which can close northern-exposed sites for days at a time. Ionian sites on the western side of the country are more sheltered and reliable in summer. The approved diving zones continue to expand — check the Greek Diving Federation for current listings of permitted areas before visiting remote islands. Open the map to locate dive centres and sites across the Greek islands and mainland coast.