Tiber

One of the major rivers of Italy, and the route of communication between Rome and the Sea was c. 19km to the north-east of Portus, and flowed into the sea just ti the west of Ostia. Its course has changed since antiquity following a major flood in the 16th c. A sand bar at the mouth of the Tiber made it hard for ships to reach Rome. (First present on Period 1 map).