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Very difficult level. The route takes riders up the Col de l’Epine (987 m). Take care – several sections are very technical.
Follow the itinerary of circuit n°4 till "Guillets", then join the road of Col de l'Epine. Right before reaching the pass, you are going through a forest road leading to the parking lot of la combe d'armée. At the parking lot, take the path on the left. The ascent will quickly become steep with a section where you will need to push the bike. You will reach a bifurcation where you will need to go straight instead of going towards Château Richard. You will ride through a relatively flat section before going down again. Follow the markings through the forest. You will reach a tarmac forest road that you will descent till a restaurant-chalet, in front of which you keep left and go down the forest. Be aware that some sections become very technical. Be careful to follow the signs as you will cross a lot of crossroads on the path.
The circuit eventually leaves the forest to go left on D41. You will cross la Rossière, where you will have a magnificent view on the lake. The circuit ends with the junction with the road of the pass that will lead you on the edge of the lake after a small ascent till Villas Doria (circuit n°4).