Kasos Kasos Kasos (; , ), also Casos, is a Greek island municipality in the Dodecanese. It is the southernmost island in the Aegean Sea, and is part of the Karpathos regional unit. , its population was 1084. The island is known in Italian as "Caso". Kasos lies southwest of Karpathos, between this island and Crete. Adjacent to the island is the Strait of Kasos, through which some of the Modified Atlantic Water enters the Sea of Crete. Its shape is elliptic and resembles that of Rhodes. The main island has a surface of , and it is long and wide.
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