hiking track of the pertes de l`ain, losses of the ain, jura

ain autumn billaude biotop bleu bridge canyon cascade cave cavities chalain claude cliff creek dam diaclase doucier erosion fall forest forge formation geology gouffre hedgehog herisson jura lake layers limestone mill moss mountain pertes petrified pipes plant pool power river scenery scenic shapes sinkhole slab stalactites stream valley vouglans waterfall