Kos or Cos (Greek; Κως) is a Greek islan in the south Sporades group of the Dodecanese, next to the Gulf of Gökova/Cos. It measures 40 km by 8 km, and is only 4 km from the coast of Bodrum, Turkey and the ancient region of Caria. The island has both fertile plains and infertile highlands with a population of 30,947. It is comprised of three municipalities: Kos, the administrative center and largest town (pop. 17,890), Dikaio, and Irakleides.