The Via Portuensis was an ancient Roman road, leading to the Portus constructed by Claudius on the right bank of the Tiber, at its mouth.
The Porta Portuensis of the Aurelian Walls had a double arch, probably owing to the amount of traffic it had to carry, but the divergence occurred a good deal further on, probably a mile from the gate.
With the growth of importance of the Via Portuensis from the time of Constantine onwards, that of the Via Ostiensis correspondingly decreased.
Procopius, who describes how barges were dragged up the river by teams of oxen moving along it, must be describing the towpath, and not either the Via Portuensis or even the Via Campana, which is in many places at quite a considerable distance from the winding course of the river.
The road starts today from the Porta Portese and, after Ponte Galeria, ends in the comune of Fiumicino.