It comprised not only the island, which was divided into districts called tourmai, but also the mainland duchy of Calabria (Greek: δουκᾶτον Καλαυρίας, doukaton Kalavrias), which extended roughly up to the river Crati.
See ei koosnenud vaid saarest, mis oli jagatud ringkondadeks (tourma), vaid ka mandri Calabria hertsogkonnast (kreeka: δουκᾶτον Καλαυρίας, doukaton Kalavrias), mis ulatus laias laastus kuni Crati jõeni.