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The Combe de Blanc in Chadouillet
Walker 
7.76 km
+80 m
-79 m
2h 25
Moderate
Departure from Saint-André-de-Cruzières (Ardèche)
A short hike with no major difficulties, but best avoided during hot weather. The elevation gain is low, and overall the paths are not too difficult and are often marked in yellow. It is possible to descend to the Cotepatière resurgence and back, preferably after rain, otherwise it is dry.
I am providing the details of the "les résurgences" hike, which you walk along for a while.