European archaeologists believe they have finally found the exact location of the river harbor of Ostia. This is an aerial view of Ostia and the position of its ancient harbor. Sampling sites are shown in red (S. Keay) Ostia was a harbor city situated at the mouth of the river Tiber, some 18 miles (30 km) to the west of Rome. It was founded by Ancus Marcius, the legendary fourth king of Rome, around 620 BC. The settlement is supposed to have aimed...