The Drac is a 130-kilometre (81 mi) 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, which 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.