Cascade du Déroc, 32-meter waterfall in Nasbinals, France

Cascade du Déroc is a waterfall in Nasbinals that drops about 32 meters from basalt cliffs into a small cave lined with distinctive basalt columns. The water flows over natural rock layers and lands in a pool surrounded by steep, dark stone walls.

The step of the fall comes from a fracture that appeared when the Aubrac was uplifted under compressive stress from the Alpine orogeny. The cliff is basaltic, made of two superimposed lava flows that form a large stair step, and the stream des Salhiens drops 32 metres over it. The fall hides a small cave whose ceiling is made of basalt prisms.

The name Déroc comes from the Occitan 'darròc', meaning a rocky place, after the basalt cliff the stream falls over. The site served as a filming location for the film Rémi sans famille, which brought it wider attention beyond the Aubrac.

A footpath from the D 52, the "route des lacs", leads to the top of the cliff; the site is not secured and the risk of falling from the edge is real, so keep back from the rim. The foot of the fall is reached by a rough trail that skirts the cliff on the left as you arrive.

The cascade hides a small cave whose ceiling is made of basalt prisms, the same columns formed by two stacked lava flows that create the cliff's step. The stream is the Ruisseau des Salhiens, outlet of Lac des Salhiens and a sub-tributary of the Bès via the Gambaïse, not of the Truyère. The site also served as a filming location for Rémi sans famille.