I′OS, or NI′O. One of the Cyclades, Greek Archipelago, situated about 13 miles south of Naxos (Map: Greece, G 5). Its area is over 45 square miles and its surface very mountainous. The inhabitants cultivate olives and the vine, and raise cattle. The only town, Ios, has a population of 2000. According to local tradition, Homer was buried on the island.