Kythnos (Greek: Κύθνος) is a Greek island and municipality in the Western Cyclades between Kea and Serifos. It is 56nmi from the harbor of Piraeus. The municipality Kythnos is 100.187km2 in area and has a coastline of about 100km. It has more than 70 beaches, many of which are still inaccessible by road. Of particular note is the crescent-shaped isthmus of fine sand at Kolona.
