Wikipedia: Ios 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 105 km (41 mi). Population was 1,820 in 2006 (down from 3,500 in the 19th century). more...