Kos Kos Kos or Cos (; ) is a Greek island, part of the Dodecanese island chain in the southeastern Aegean Sea, off the Anatolian coast of Turkey. Kos is the third largest island of the Dodecanese by area, after Rhodes and Karpathos; it has a population of 33,388 (2011 census), making it the second most populous of the Dodecanese, after Rhodes. The island measures , and is from the coast of the ancient region of Caria in Turkey. Administratively, Kos constitutes a municipality within the Kos regional unit, which is part of the South Aegean region. The principal town of
Dodecanese sources in the 8th century, as a naval command under a "droungarios", encompassing the southern Aegean Sea, which eventually evolved into the Theme of Samos. However it was not applied to the current island group, but to the twelve Cyclades islands clustered around Delos. The name may indeed be of far earlier date, and modern historians suggest that a list of 12 islands given by Strabo ("Geographica" Χ.485) was the origin of the term. The term remained in use throughout the medieval period and was still used for the Cyclades in both colloquial usage and scholarly Greek-language literature until the