Ios (Greek: Ίος) is an island in the Cyclades group in the Aegean Sea. It is a part of Greece. Ios is a hilly island with cliffs down to the sea on most sides, situated halfway between Naxos and Santorini. It is about 18km (11 mi) long and 10km (6 mi) wide, with an area of about 109 km² (42 mi²). Population was 1,838 in 2001 (down from 3,500 in the 19th century). Ios was the setting for the movie Ginger and Cinnamon (Dillo con parole mie).