To the east this plain stretches in an unbroken level, as far as the eye can follow it, towards Venice and the Adriatic; on the southern side the line of the Apennines from Bologna to Genoa closes the view; to the west rise the Maritime, Cottian and Graian Alps, with Monte Viso as their central point; while northward are the Pennine, Helvetic and Rhaetian Alps, of which Monte Rosa, the Saasgrat and Monte Leone are the most conspicuous features.
Below Aosta also the Dora Baltea receives several considerable tributaries, which descend from the glaciers between Mont Blanc and Monte Rosa.
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Or the west side of the lake the Toccia or Tosa descends from the pass of the Gries nearly due south to Domodossola, where it receives the waters of the Doveria from the Simplon, and a few miles lower down those of the Val d'Anzasca from the foot of Monte Rosa, and 12 m.
The mining operations are chiefly centred in the Sierra Mojada, Sierra Carmen, and in the Santa Rosa valley.
