The Apennines traverse Italy in its whole length. They begin where the Alps end, near Savona, and their chain proceeds, continually rising in elevation, as far as the centre of the peninsula. Mount Velino is their culminating point, and from thence the Apennines continue decreasing in height, until they reach the extremity of the kingdom of Naples. In the northern region they approach the Adriatic; but, in the centre, they cut the peninsula into two parts nearly equal; then, at Mount Caruso (_Vultur_), near the source of the Bradano (_Bradanus_), they separate into two branches, one of which penetrates into Calabria, the other into the Terra di Bari as far as Otranto. The two slopes of the Apennines give birth to various streams which flow some into the Adriatic and others into the Mediterranean. On the eastern side the principal are--the Rubicon, the Pisaurus (_Foglia_), the Metaurus (_Metauro_), the Æsis (_Esino_), the Truentus (_Tronto_), the Aternus (_Pescara_), the Sangrus (_Sangro_), the Trinius (_Trigno_), the Frento (_Fortore_), and the Aufidus (_Ofanto_), which follow generally a direction perpendicular to the chain of mountains. On the western side, the Arnus (_Arno_), the Ombrus (_Ombrone_), the Tiber, the Amasenus (_Amaseno_), the Liris (_Garigliano_), the Vulturnus (_Volturno_), and the Silarus (_Silaro_ or _Sile_), run parallel to the Apennines; but towards their mouths they take a direction nearly perpendicular to the coast. The Bradanus (_Bradano_), the Casuentus (_Basiento_), and the Aciris (_Agri_), flow into the Gulf of Tarentum. We may admit into ancient Italy the following great divisions and subdivisions:-- To the north, the Senones, a people of Gallic origin, occupying the shores of the Adriatic Sea, from the Rubicon to the neighbourhood of Ancona; Umbria, situated between the Senones and the course of the Tiber; Etruria, between the Tiber and the Mediterranean Sea. In the centre the territory of Picenum, between Ancona and Hadria, in the Abruzzo Ulteriore; Latium, in the part between the Apennines and the Mediterranean, from the Tiber to the Liris; to the south of Latium, the Volsci, and the Aurunci, the _débris_ of the ancient Ausones, retired between the Liris and the Amasenus, and bordering upon another people of the same race, the Sidicines, established between the Liris and the Vulturnus; the country of the Sabines, between Picenum and Latium; to the east of Latium, in the mountains, the Æqui; the Hernici, backed by the populations of Sabellian stock, namely, the Marsi, the Peligni, the Vestini, the Marrucini, and the Frentani, distributed in the valleys through which run the rivers received by the Adriatic from the extremity of Picenum to the River Fortore.