Beginning from the group called the Alpi della Luna near the sources of the Tiber, which attain 4435 ft., they are continued by the Monte Nerone (5010 ft.), Monte Catria (5590), and Monte Maggio to the Monte Pennino near Nocera (5169 ft.), and thence to the Monte della Sibilla, at the source of the Nar or Nera, which attains 7663 ft.
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.
Above the Nera valley, at the point where the river traverses a narrow ravine, and commands a fine view.
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.
Above sealevel, in the valley of the Nera (anc. Nar), from which the town took its distinguishing epithet, 5 m.
Its principal tributaries are the Paglia, the Nera and the Anio or Teverone, and it is generally navigable by boats up to the confluence of the Nera, a distance of 104 m., though, owing to the rapidity of the current, there is very little navigation above Rome.
ORTIGUEIRA, a seaport of north-western Spain, in the province of Corunna; on the northern slope of the Sierra de la Faladoira, on the river Nera and on the eastern shore of the Rfa de Santa Marta - a winding, rock-bound and much indented inlet of the Bay of 'Biscay, between Capes Ortegal and Vares, the northernmost headlands of the Peninsula.