This loop takes the road alongside Lac de Chaudanne to reach the village of Demandolx, then forks right onto a track shortly before the Col de Saint Barnabé.
Below the Teillon massif, which rises to 1893 m, the descent is made on a single track via the GR4. This route, which offers a bird's-eye view of the lake, takes in the mountain scenery near Castellane.
If you're feeling sporty, this itinerary will take you 2h30.