The Drac is a 130-kilometre long river in southeastern France. It is a left tributary of the river Isère. It is formed at the confluence of the Drac Noir and the Drac Blanc, that both rise in the southern part of the Massif des Écrins, high in the French Alps. It flows through several reservoirs on its course, including the Lac de Monteynard-Avignonet. It flows into the Isère at Grenoble. Its major tributary is the Romanche.
The average flow of the Drac at Fontaine is 97 cubic metres per second , with the highest monthly flows occurring in June, due to the melting of Alpine glaciers. The catchment area of the river is 3,550 square kilometres , which has an average rainfall of 859 millimetres .
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