The Dodecanese contain islands.
Dodecanese . They belong to the wider Southern Sporades island group . Of the others , Kos and Patmos are historically the more important ; the remaining eleven are Agathonisi , Astypalaia , Kalymnos , Karpathos , Kasos , Leipsoi , Leros , Nisyros , Symi , Tilos , and Kastellorizo . Other islands in the chain include Alimia , Arkoi , Chalki , Farmakonisi , Gyali , Kinaros , Levitha , Marathos , Nimos , Pserimos , Saria , Strongyli , Syrna and Telendos .