A simple route, strongly recommended, with very little uphill.
It starts very calmly near the 'Lac de Joux'. There are quite a few people, but these tend to be people that respect and love nature. At around the middle of the lake, you must climb a little to arrive to 'Le Lieux', where we continue touring the lake but this time at a higher altitude. In this route we have been fortunate enough to sight two deer or 'chamois' and they haven't shown themselves to be shy.
We start at the camping place of Vallorbe, with a strong vertical slope untin we cross the col. From there, we descend through a minor road until Vailion. After crossing the village we enter once more at the forest, where we cross a defensive system (the toblerones) where we start once more to descend, following the river. In the last part, we walk next to the river and cross wooden bridges several times.