The exarchate was organised into a group of duchies (Rome, Venetia, Calabria, Naples, Perugia, Pentapolis, Lucania, etc.) that were mainly the coastal cities in the Italian peninsula since the Lombards held the advantage in the hinterland.

The civil and military head of these imperial possessions, the exarch himself, was the representative at Ravenna of the emperor in Constantinople. The surrounding territory reached from the River Po, which served as the boundary with Venice in the north, to the Pentapolis at Rimini in the south, the border of the "five cities" in the Marches along the Adriatic coast, and reached even cities not on the coast, such as Forlì.;