The western part of present-day Slovenia belonged to Regio X of Italy in the Early Imperial Period and for the most part to the province of Venetia et Histriain the Late Roman period. It is a transitional area, crossed by the prehistoric Amber Route and later the viae publicae Aquileia–Emona–Carnuntum and Emona–Sirmium that connected the northern Adriatic with the central Danube Basin and the northern Balkans.