
It takes its source on the slopes of Mount denier and cross the plateau of Valensole to throw itself at the foot of the Greoux dam. The Colostre is a biological reservoir of great importance for Lower Verdon and Durance, allowing aquatic species to reproduce and grow there. The river is home to some iconic species such as the White-footed Crayfish or the Beaver. It could still accommodate many others, such as Chabot or Otter.