Ios Island, Greece.
Although the island has no airport, it has one or more daily connections to Piraeus either by regular ferry (8–10 hours) or by high-speed vessel (4½ hours).
Ios is also a terminus of the route operated by SAOS Ferries from Santorini and Anafi, via Sikinos and Folegandros, offering connections with these lesser islands five times weekly. In the summer there are also fast links almost daily with Santorini and Naxos by Flying Dolphin.
Ios Travel Guide