The Roman province of the 1st century BC was bounded on the north and west by the Alps, in the south as far as Placentia by the river Po, and then by the Apennines and the river Rubicon, and in the east by the Adriatic Sea. In 49 BC all inhabitants of Cisalpine Gaul received Roman citizenship, and eventually the province was divided among four of the eleven regions of Italy: "Regio VIII Gallia Cispadana", "Regio IX Liguria", "Regio X Venetia et Histria" and "Regio XI Gallia Transpadana".