It rises at Puyfraud and flows 22 km further into the Briance. It is an abundant river, sometimes subject to flooding. There are trout, sculpins and minnows, species very sensitive to the quality of the aquatic environment, such as the European Otter, which also inhabits this watercourse, and the Eurasian water shrew, one of the largest shrew species. Finally, there are several species of toads, frogs, and other salamanders, newts, and green and yellow snakes.