Romagna, or Emilia-Romagna, is a region in north-central Italy. It was one of the regions that Cesare Borgia sought to control, hoping to extend the Papal State to this area. One way he thought he might be able to extend his control here is through the use of inventions by da Vinci. The region of Romagna extends from the Adriatic Sea across almost the entire peninsula and is bounded by the Po River to the north and the Ligurian and Tuscan Apennines to the west and south.