Wikipedia: Kythnos or Kithnos is a Greek island in the Western Cyclades between Kea and Serifos. It is 56 nautical miles from the harbor of Piraeus. Kythnos is about 100 square kilometers in area and has a coastline of about 100 kilometers. 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, where sunbathers may relax with the sea lapping at both sides of the beach. more...