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Alonnisos Marine Park

A large protected sea area around Alonnisos and a group of uninhabited islets, created for the Mediterranean monk seal.

Updated 19 October 2026

Alonnisos Marine Park

AI illustration

WhereSporades
Nearest cityPatitiri
Best seasonMay to September
Time to allowA full day for a boat trip
Getting thereFerries to Alonnisos from Volos and Agios Konstantinos; licensed boat trips leave from Patitiri
EntryFree to enter the island; boat trips charged

The marine park covers the sea around Alonnisos and a scatter of uninhabited islets to the north, and it is one of the largest protected marine areas in Europe. It exists mainly for the Mediterranean monk seal, a species that breeds in sea caves and does not tolerate disturbance, so the park is split into zones with different rules. Piperi, the core island, is closed to visitors entirely. Licensed day boats from Patitiri work the accessible parts, usually calling at Kyra Panagia with its monastery and grazing goats, the sheltered bay at Peristera, and one or two swim stops on the way. Dolphins turn up far more often than seals do. In Patitiri a small information point explains the conservation work.

History

After a series of exploratory trips to the islands in 1976, the German zoologist and wildlife film-maker Thomas Schultze-Westrum first drew attention to their great ecological value and proposed a protected area; six years later, after consultation, the fishermen of Alonnisos agreed to a park and undertook to help protect it. The decree that later fixed the protected zones made no provision for a local management body, so the conservation group MOm, with support from the European Commission, set up a programme to support and monitor the reserve with local boat operators and the fishing cooperative (Wikipedia, Alonnisos Marine Park).

What you'll find

  • Kyra Panagia - an uninhabited island with a monastery, a sheltered anchorage and old terraces.
  • The seal information point in Patitiri - a short, plain explanation of why the zones exist.
  • Peristera bay - a long, quiet anchorage used as a swim stop on most trips.
  • The boat crossing itself - open water, seabirds and regular dolphin sightings between islands.

When to go

Boats run roughly May to September and stop when the meltemi blows, which it does hardest in July and August. June and September give calmer seas and fewer people on the same boat. Trips are full days leaving in the morning, so plan nothing else. Book a day or two ahead in peak season; small operators sell out.

What to expect

Seal sightings are genuinely rare and no operator can promise one, so treat any as luck. The trips are long hours on a small boat, uncomfortable if you get seasick, and cancelled at short notice in wind. There is no visitor centre in the usual sense. Per-person prices add up quickly for a family, and the swim stops are the part most people remember.

Nearby

Alonnisos old village at Chora, the beaches of the east coast and the island of Skopelos.

Key facts

Local nameΘαλάσσιο Πάρκο Αλοννήσου (Greek)
Established1992
Area2,260 km² (873 sq mi)
Location39.3071° N, 24.1476° E · map

Source: Wikidata, item Q3043336, read on 18 October 2026.

What to pack for Alonnisos Marine Park

Chosen from what this place is for. Tap a kit for the full checklist.

  • Broken-in walking shoes or boots - Grip and ankle support matter more than looks; never hike in brand-new boots. Find on Amazon
  • Travel rod + reel - A packable multi-piece rod fits in a case and covers most holiday fishing. Find on Amazon
  • Reef-safe sunscreen - High SPF that will not bleach the coral you are swimming over. Find on Amazon
  • Head torch + spare batteries - Hands-free light is essential; caves are truly dark. Find on Amazon

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Opening times, ticket prices and seasonal closures change - check the official source before you go: official site.

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