Dora Riparia

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The Dora Riparia (Italian: [ˈdɔːra riˈpaːrja]; Piedmontese: Dòira Rivaira or simply Dòira), or Doire Ripaire (French: [dwaʁ ʁipɛːʁ]; also simply Doire; Occitan: Dueira), is an Alpine river, mostly flowing in Piedmont, Northwest Italy as a left-bank tributary of the Po. It is 125 kilometres (78 mi) long (of which 5 km is in Provence-Alpes-Côte d'Azur, Southeast France), with a 1,231 square kilometres (475 sq mi) drainage basin. It originates in the Cottian Alps, close to the Col de Montgenèvre in France, where it is called the Piccola Dora or Petite Doire ("Small Dora"). Its name becomes the Dora Riparia after the confluence with the Ripa in the Argentera Valley and the Thuras de Bousson close to Cesana Torinese. Further down the valley, in Oulx, the river grows thanks to its main upper tributary, the Dora di Bardonecchia, and before Susa is augmented by the Galambra and Cenischia. After Susa, it only receives minor tributaries: from the left, Gravio by Condove, Sessi by Caprie, and Messa by Almese, from the right Scaglione by Meana and Gravio by Villar Focchiardo. It runs through the Susa Valley, and after having crossed part of the plain of the Po and the territories of the comunes of Avigliana, Alpignano, Pianezza and Collegno, joins the Po at Turin. It is considered a "stream" (torrente) until Susa, and a river (fiume) to Turin. It was at the confluence of the Dora Riparia and the Po that present-day Turin was founded in Roman times. Dora Riparia was there for a long time the main source of energy: already in medieval times its water was collected in canals (duriae) that drove mills, water wheels and other contraptions. In the area between the confluence of Dora Riparia and Stura in the Po, where before the destruction caused by the Battle...