The river that runs through Rome is the Tiber. This river is essential for Rome's historical development and has served as a vital waterway since ancient times. The Tiber flows approximately 405 kilometers and has played a significant role in shaping the landscape and culture of the region. Its banks are lined with archaeological sites, historic structures, and parks, making it a fundamental aspect of both ancient and modern Roman life. The river also contributes to the area's biodiversity and ecosystem.