The
Dora Riparia (; ) is an alpine river, a left-hand tributary of the
Po. It is long, with a
drainage basin. It originates in the
Cottian Alps, close to the
Col de Montgenèvre in France, where it is called the Piccola 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.