up at it as shown would be unstable in the full force of the current. Moreover, the masts would have to be shipped for passage under the bridges. One can readily see how unsuitable the river was for sea-going traffic and how necessary the port of Ostia would have been to Rome.

The opening of the Cloaca Maxima is between the docks and the stone bridge. Beyond the bridge you can just see the Aesculapium on Tiber Island. Looming over the whole scene is the Capitoline,