L'Écoutoux, Mountain peak in Sappey-en-Chartreuse, France.

L'Écoutoux is a 1,406-metre summit at the southern end of the Chartreuse range in the Alps. Its south face is a characteristic anticline, and the last few metres of the summit hold small lapiaz. From the Isère quays in Grenoble it reads as a triangle between Mont Rachais and Mont Saint-Eynard.

The peak is part of the Chartreuse range, a geological formation shaped over millions of years by Alpine uplift and folding. Its structure reflects the natural forces that have molded the entire massif through time.

Locals know the saying "de l'Écoutoux, on voit tout!" (from the Écoutoux, you see everything), and older residents pass it on to newcomers. The climb is commonly recommended to beginners and families, starting from the hamlet of Bens in Le Sappey-en-Chartreuse or from the col de Palaquit.

The hike starts from Sappey-en-Chartreuse and follows marked trails through forest before reaching more open terrain near the peak. The round trip takes several hours and suits hikers with moderate fitness who are comfortable with steady climbing.

The peak displays lapiaz formations, a limestone landscape carved with sharp fissures and grooves created by natural water dissolution over centuries. This geological feature is one of the most visible characteristics of the summit area and stands out distinctly from the surrounding terrain.