Starting from the village of Saint-Martin, this route will take you into the La Borgne gogres. This long descent is divided into two parts, with a short break in the middle at the Sevanne chalets. The trail is narrow and steep. You will then follow the stream, enjoying magnificent views of the valley floor. The following ascent is done in two stages : steep from the stream, a circular trail allows you to catch your breath before the final section. 

Caution : Special attention is advised for those prone to vertigo. The La Luette footbridge is beautiful but can be intimidating.