Alonissos
Alonissos offers a truly unique diving experience, centered around the National Marine Park of Alonissos and Northern Sporades, the largest protected marine area in Europe. Its main draw is the incredible Peristera shipwreck, a 5th-century B.C. vessel that has been transformed into Greece's first underwater museum. This site allows divers to witness ancient history firsthand, exploring a massive mound of well-preserved amphorae. The diving here is not just about marine life but about immersing oneself in a submerged archaeological wonder, making it a bucket-list destination for history enthusiasts.
Diving conditions in Alonissos are characterized by the calm, clear waters of the Aegean Sea, with visibility often exceeding 20 meters. Beyond the historical wrecks, the marine park's protected status ensures a healthy ecosystem teeming with life. Divers can expect to encounter groupers, moray eels, scorpionfish, and occasionally the critically endangered Mediterranean monk seal. The combination of pristine natural beauty, exceptional water clarity, and the unparalleled opportunity to dive a classical-era shipwreck makes Alonissos a compelling and unforgettable destination for divers of all interests.
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Frequently Asked Questions
What's the most popular dive site in Alonissos, Greece?
The most popular dive site in Alonissos, Greece, is unquestionably the Peristera Shipwreck. It's famous for being Greece's first underwater museum, showcasing a massive 5th-century B.C. merchant ship's cargo of wine amphorae. Its historical significance and the unique, structured way the dive is conducted make it a globally recognized site. Access is strictly controlled, and dives must be booked with authorized dive centers, adding to its exclusive appeal. It's a must-do for any visiting diver.
What are the good and less popular dive sites in Alonissos, Greece?
Besides the famous Peristera shipwreck, the Blue Cave is another well-known site, loved for its dramatic topography and light play. For a hidden gem, try diving around the islet of Piperi, the core zone of the marine park. Access is restricted, but special permits can sometimes be obtained for spectacular diving with large fish populations and a high chance of spotting monk seals. Mourtias Pinnacle is another less-crowded site offering great marine biodiversity and interesting rock formations.
What water temperature is it like throughout the year diving in Alonissos, Greece?
Water temperatures in Alonissos, Greece, vary seasonally. During the peak diving season from June to September, temperatures range from 22°C to 26°C (72°F to 79°F). In the shoulder months of May and October, it drops to around 18-21°C (64°F to 70°F). In winter (December-February), the water can be as cold as 14°C (57°F). Surface temperatures can be warmer, but thermoclines are common at depth, especially in early summer.
When is the best time to visit Alonissos, Greece?
The best time for diving in Alonissos, Greece, is from June to September. During these months, you'll experience the warmest water temperatures, excellent visibility, and calm sea conditions. The weather is hot and sunny, ideal for a dive holiday. The shoulder seasons of May and October also offer good diving with fewer crowds, though the water is cooler. Most dive centers operate from May through October, closing during the winter months due to rougher seas and colder temperatures.
What's the visibility like during the dive season in Alonissos, Greece?
The underwater visibility in Alonissos, Greece, is generally excellent, typical of the Aegean Sea. During the main dive season from late spring to early autumn, visibility often ranges from 20 to 30 meters (65 to 100 feet) and can sometimes exceed this on calm, clear days. It is usually at its best in the summer. Plankton blooms in early spring can temporarily reduce visibility, but for the most part, you can expect crystal-clear conditions to enjoy the stunning underwater landscapes.
Are there any seasonal migrations or special events (e.g., manta rays, whale sharks) in Alonissos, Greece?
Alonissos, Greece, is not known for large-scale migrations like whale sharks or manta rays. However, the key special encounter is the chance to see the critically endangered Mediterranean monk seal. The National Marine Park is a vital breeding ground for them. While sightings are rare and not guaranteed, the possibility adds a unique thrill to every dive. The summer months offer the highest probability of encounters as they are more active. There are no specific mass spawning events targeted by divers.
What marine life can I expect to see in Alonissos, Greece?
The protected waters of Alonissos, Greece, host a rich variety of Mediterranean marine life. Divers can commonly expect to see large dusky groupers, moray eels, conger eels, scorpionfish, octopuses, and lobsters. Schools of damselfish, saddled seabream, and salema are abundant. You may also spot amberjacks and dentex. The luckiest divers might encounter dolphins, loggerhead turtles, or the rare Mediterranean monk seal, the park's most famous resident. The ancient amphorae are also colonized by colorful sponges and invertebrates.
What thickness wetsuit should I wear in Alonissos, Greece?
For diving in Alonissos, Greece, a 5mm full wetsuit is a versatile choice for most of the season (May-October). In the peak summer months of July and August, when water temperatures are above 24°C (75°F), a 3mm shorty or full suit may be sufficient for some. For the cooler shoulder months of May and October, or if you are prone to getting cold, a 7mm wetsuit or a 5mm with a hood and vest is recommended, especially for deeper dives where thermoclines exist.
How do I get to Alonissos, Greece?
To reach Alonissos, Greece, you typically fly into Skiathos Island National Airport (JSI), which receives international charter flights in summer. From Skiathos, you take a ferry or hydrofoil to Alonissos, which takes approximately 1.5 to 2.5 hours. Alternatively, you can fly to Athens (ATH) or Thessaloniki (SKG), travel to the ports of Volos or Mantoudi, and then take a longer ferry ride (3-5 hours) to Alonissos. Booking ferries in advance during high season is recommended.
Should I book a liveaboard or stay on shore in Alonissos, Greece?
All diving in Alonissos, Greece, is shore-based. There are currently no dedicated liveaboards operating exclusively within the Alonissos marine park. You should book accommodation in one of the island's towns, like Patitiri or Steni Vala, and arrange daily dive trips with one of the local, authorized dive centers. This setup allows you to enjoy the island's culture, cuisine, and scenery in addition to your dives. All dive sites, including the remote ones, are accessed via daily dive boats.