The National Marine Park of Alonissos is one of the most logical destinations for an explorer yacht in the Aegean. Three explorer yachts currently charter in Greece, and the protected waters around the outer Sporades islands are exactly the kind of destination these vessels were built to reach. High-capacity fuel tanks, capable tenders, dive compressors and robust construction allow an explorer charter to spend days in the marine park without returning to a marina, operating on the vessel’s own resources.nnThe outer islands of the Alonissos marine park, including Gioura, Psathoura and Piperi (the latter closed to visitors due to monk seal protection), represent some of the least-visited coastline in the Mediterranean. An explorer yacht with a zodiac gives guests access to sea caves, submerged archaeological sites and cliff anchorages where the swell permits. The park’s rich fishing grounds mean exceptional snorkelling and diving, and a crew with underwater credentials can add dive trips to each day’s programme.nnWeekly rates for explorer yachts chartering around Alonissos and the Sporades typically run from 80,000 to 400,000 euros before expenses. The APA of 30 percent covers fuel for extended operations, provisions and any specialist equipment. September and October are particularly well-suited to explorer charter in this region: the monk seal population is more visible, the sea state around the outer islands is more manageable and the total absence of day-trip boats makes the experience entirely private.nnA Sporades-based explorer charter can extend north to Thassos and Samothraki for guests with two weeks available.