Ios (locally Νιός - Nios) is a Greek island in the Cyclades group in the Aegean Sea. Ios is a hilly island with cliffs down to the sea on most sides, situated halfway between Naxos and Santorini. It is about 18 km (11 mi) long and 10 km (6 mi) wide, with an area of about 109 km² (42 mi²) (...) (from Wikipedia)