Sepolcro and Città di Castello, then between Perugia and Todi to Orte, just below which it receives the Nera.
The Nera, which rises in the lofty group of the Monte della Sibilla, is a considerable stream, and brings with it the waters of the Velino (with its tributaries the Turano and the Salto), which joins it a few miles below its celebrated waterfall at Terni.
The Teverone or Anio, which enters the Tiber a few miles above Rome, is an inferior stream to the Nera, but brings down a considerable body of water from the mountains above Subiaco.
The rivers of the northern versant, such as the Nera, are, like those of Asturias, for the most part short, rapid and subject to violent floods.
They offered a singular attraction to the Romans, and their presence in remote parts of the Mi nera country no doubt was often the principal cause of Roman S pr i ngs.