Aerial view of the ports of Claudius and Trajan in Portus. The drawing is in landscape format and has no frame. Inscriptions appear on the reverse.
The drawing shows the city’s two seaports, Portus Claudius and Portus Trajan. The harbor complex opens with the Port of Claudius, visible on the left. A quadrangular basin is protected by a dike. A lighthouse marks its position at the entrance to the channel. Trajan’s port is on the right. It consists of a hexagonal basin lined with warehouses. The town of Portus lies behind it. On the right, a canal, the Fossa Traiana, links the Tiber to the sea.