Montignac , also called Montignac sur Vézère or Montignac-Lascaux, is a commune in the Dordogne department in Aquitaine in southwestern France. It is a small town situated on the Vézère river and has been the capital of the canton of Montignac since 1790. In 2015 it became the capital of the newly created Canton de la Vallée de l'Homme.