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

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