It extended from the west coast near Ostia, over the Alban Hills south of Rome, from Valmontone to Avezzano and then to Pescara on the Adriatic coast.
The route began at the western edge near Ostia, traversed the Alban Hills south of Rome, passing through Valmontone before reaching Avezzano and finally arriving at Pescara on the Adriatic coast, which was a significant part of its overall path.