The Aniene (pronounced [aˈnjɛːne]; Latin: Aniō), formerly known as the Teverone,[1] is a 99-kilometer (62 mi) river in Lazio, Italy.

It originates in the Apennines at Trevi nel Lazio and flows westward past Subiaco, Vicovaro, and Tivoli to join the Tiber in northern Rome.

It formed the principal valley east of ancient Rome and became an important water source as the city's population expanded.

Rome's foundation myths numbered them among the Sabines seized by Romulus but that his wife Hersilia convinced him to make its people Roman citizens after their defeat and annexation around 752 BC.

[10] A series of floods during the early nineteenth century, especially the most serious one in 1826, prompted Popes Leo XII and Gregory XVI, as sovereigns of the Papal States, to undertake construction works to control the flow of the water.