The Valdigne is the upper part of the Aosta Valley in north-west Italy. It is traversed by the Dora Baltea

Dora Baltea

Dora Baltea or Doire Baltée , is a river in northern Italy. It is a left-hand tributary of the Po River, and is about 160 km long...

, a tributary of the Po.

It extends from Derby (a frazione

Frazione

A frazione , in Italy, is the name given in administrative law to a type of territorial subdivision of a comune; for other administrative divisions, see municipio, circoscrizione, quartiere...

of La Salle

La Salle, Italy

La Salle is a town and comune in the Aosta Valley region of north-western Italy.-Economy:The economy of La Salle is, today, mainly based on tourism, during summer and winter seasons. Nevertheless, it remains some handicraft and agricultural activities. In particular the viticulture with the...

) to Courmayeur

Courmayeur

Courmayeur is an Italian town and comune in the autonomous region of Aosta Valley, in northern Italy. It is located at the foot of Mont Blanc, the highest mountain in western Europe, in the Graian Alps range, and is crossed by the Dora Baltea...

, including the side valleys of Val Ferret

Val Ferret

Val Ferret is the name of the two valleys departing from the Col Ferret on the border between Italy and Switzerland, on the southern side the Mont Blanc Massif. To the northeast, the Swiss valley, which drains into the Rhône basin; to the southwest, the Italian valley, which drains into the Po...

, Val Veny

Val Veny

Val Veny is a lateral valley of the Mont Blanc massif, lying to the south-west of Courmayeur. The valley head is at the col de la Seigne, over which lies the Tarentaise Valley.- Geography:...

 and Vallone di La Thuile.

The communes which belong to the Valdigne are Courmayeur, La Salle, La Thuile, Morgex

Morgex

Morgex is a town and comune in the Aosta Valley region of north-western Italy....

 and Pré-Saint-Didier

Prè-Saint-Didier

Pré-Saint-Didier is a town and comune in the Aosta Valley region of north-western Italy, at 1,004 m above sea level.-Transportation:A terminus of a regional railway is located there; direct trains connect the town with Aosta, which is connected to the rest of the Italian network...

: together they make up the municipal union the Comunità Montana Valdigne Mont Blanc.