A map of the environs of Ostia from 1547
A map of the environs of Ostia by Eufrosino della Volpaia from 1547. Remains of the aqueduct can be seen in the upper part. Below is what seems to be an aqueduct, but is in reality the Via Ostiensis, raised and passing through swamps.
From Broccoli 1988, p. 39.