Kythnos (Greek: Κύθνος), commonly called Thermia (Greek: Θερμιά), is a Greek island and municipality in the Western Cyclades between Kea and Serifos. It is 56 nautical miles (104 km) from the Athenian harbor of Piraeus. In the legends and beliefs of Kythnos there are multiple references to fairies, vampires, dragons etc. living in various places on the island such as: ancient ruins, mills, threshing floors, isolated beaches etc.
Kythnos has more than 90 beaches, many of which are still inaccessible by road. Of particular note is the crescent-shaped isthmus of fine sand at Kolona. Other beaches are: Episkopi, Apokrousi, Megali Ammos, Schinari, Simousi, Martinakia, Zogaki, Naoussa, Kouri, Agios Stefanos, Vasilika, Lefkes & Liotrivi.
