Seriphos or Serifos Island, Greece.
G.A. Ferries and Ventouris Lines run services (4 hrs 30 mins) which together provide daily connections with Piraeus by car ferry. This is supplemented in the summer season by a daily service by faster boat, operated either by Aegean Speed Lines or Hellenic Seaways Highspeed, both of which take vehicles and make the journey in 2 hrs 30 mins. Nearly all services continue to Siphnos and Milos.