The river that flows through the city of Rome is the Tiber. This historic river is approximately 406 kilometers (252 miles) long and has been crucial to Rome since ancient times. The Tiber played an essential role in the development of Roman civilization, serving as a source of freshwater and a vital transportation route. Significant landmarks along its banks include St. Peter's Basilica and the famous Isola Tiberina. The river symbolizes the city's historical and cultural heritage, while also being integral to its modern landscape.