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The Aosta Valley is the smallest Italian region and is located in the middle of the Alps, which here are divided into the sectors of the Graian Alps and the Pennine Alps. It is surrounded by the four highest mountain ranges in Italy.
The region is crossed by the Dora Baltea, an important left tributary of the river Po, which marks its main valley from which numerous secondary valleys and their tributaries branch off, including the Dora di Valgrisenche and the Lys.