The Susa Valley is a valley in the Piedmont

Piedmont

Piedmont is one of the 20 regions of Italy. It has an area of 25,402 square kilometres and a population of about 4.4 million. The capital of Piedmont is Turin. The main local language is Piedmontese. Occitan is also spoken by a minority in the Occitan Valleys situated in the Provinces of...

 region of northern Italy

Italy

Italy , officially the Italian Republic languages]] under the European Charter for Regional or Minority Languages. In each of these, Italy's official name is as follows:;;;;;;;;), is a unitary parliamentary republic in South-Central Europe. To the north it borders France, Switzerland, Austria and...

, located between the Graian Alps

Graian Alps

The Graian Alps are a mountain range in the western part of the Alps. They are located in France , Italy , and Switzerland...

 in the north and the Cottian Alps

Cottian Alps

The Cottian Alps are a mountain range in the southwestern part of the Alps. They form the border between France and Italy...

 in the south. It is the longest valley in Italy. It extends over 50 km (31.1 mi) in an east-west direction from the French

France

The French Republic , The French Republic , The French Republic , (commonly known as France , is a unitary semi-presidential republic in Western Europe with several overseas territories and islands located on other continents and in the Indian, Pacific, and Atlantic oceans. Metropolitan France...

 border to the outskirts of Turin

Turin

Turin is a city and major business and cultural centre in northern Italy, capital of the Piedmont region, located mainly on the left bank of the Po River and surrounded by the Alpine arch. The population of the city proper is 909,193 while the population of the urban area is estimated by Eurostat...

. The valley takes its name from the city of Susa

Susa, Italy

Susa is a city and comune in Piedmont, Italy. It is situated on at the confluence of the Cenischia with the Dora Riparia, a tributary of the Po River, at the foot of the Cottian Alps, 51 km west of Turin.-History:...

 which lies in the valley. The Dora Riparia

Dora Riparia

The Dora Riparia is an Italian river, a left-hand tributary of the Po. It is 125 km long, with a 1,231 km² drainage basin. It originates in the Cottian Alps, close to the Col de Montgenèvre in France, where it is called the Piccola Dora...

 river, a tributary of the Po

Po River

The Po |Ligurian]]: Bodincus or Bodencus) is a river that flows either or – considering the length of the Maira, a right bank tributary – eastward across northern Italy, from a spring seeping from a stony hillside at Pian del Re, a flat place at the head of the Val Po under the northwest face...

, flows through the valley.

A motorway runs through the valley from Turin to Chambéry

Chambéry

Chambéry is a city in the department of Savoie, located in the Rhône-Alpes region in southeastern France.It is the capital of the department and has been the historical capital of the Savoy region since the 13th century, when Amadeus V of Savoy made the city his seat of power.-Geography:Chambéry...

 in France, over the Col du Mont Cenis or by the Fréjus tunnel, and to Briançon

Briançon

Briançon a commune in the Hautes-Alpes department in the Provence-Alpes-Côte d'Azur region in southeastern France. It is a sub-prefecture of the department....

, also in France, over the Col du Mont-Genèvre.