Ostia Antica was an ancient Roman city and the port of Rome located at the mouth of the Tiber. It is near modern Ostia, 25 km (16 mi)) southwest of Rome. Due to silting and the invasion of sand, the site now lies 3 km (2 mi) from the sea. The name Ostia derives from Latin os 'mouth'.
Market square of Ostia Antica
View of the Forum from the Theatre
The Ancient Roman theatre
Via di Diana
The Tiber is the third-longest river in Italy and the longest in Central Italy, rising in the Apennine Mountains in Emilia-Romagna and flowing 406 km (252 mi) through Tuscany, Umbria, and Lazio, where it is joined by the River Aniene, to the Tyrrhenian Sea, between Ostia and Fiumicino. It drains a basin estimated at 17,375 km2 (6,709 sq mi). The river has achieved lasting fame as the main watercourse of the city of Rome, which was founded on its eastern banks.
The Tiber in Rome near the Ponte Sant'Angelo
View of the Tiber looking towards Vatican City
Rome flood marker, 1598, set into a pillar of the Santo Spirito Hospital near Basilica di San Pietro.
Highest level of Tiber for 40+ years, 13 December 2008, at Tiber Island.