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Le Creux Billard ( Doubs )
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Gérard Vidal
Gérard Vidal
Le Creux Billard est un gouffre d'effondrement de 90 mètres de hauteur situé à quelques dizaines de mètres plus haut que la source du Lison. Dans son fond, un lac est alimenté dans l'important reseau karstique du massif
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