D39 road from the village of Saint-Martinsous-Vigouroux to the village of Brezons.
This valley is one of the most beautiful u-shaped glacial valleys in Europe, according
to Haroun Tazieff, the famous volcanologist. It is dominated by a huge lava neck which
suggests the profile of a lion's head. Waterfall of the “Saut de la Truite”, villages of Brezons and Saint-Martin.