Romagna is an Italian historical region that approximately correspons to the south-eastern portion of present-day Emilia-Romagna. Traditionally, it is limited by the Apennines to the south-west, the Adriatic to the east, and the rivers Reno and Sillaro to the north and west. The region's major cities include Ravenna, Cesena, Faenza, Forlì, Imola, Rimini and San Marino (a separate nation inside the Romagna historical region).