Griven in the Grottes de Chorance
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Carved by hydro-chemical and hydraulic erosion, these beautiful caves were cut into a massive karst (limestone outcrop) by underground streams and now offer a breathtaking view made up of natural subterranean rivers and emerald lakes, cascades, caves and cavities, labyrinths of tunnels, primitive rock formations, serpentines and, of course, the many soda straws clusters. During the guided tour it is also possible to see the olm, an early form of amphibian sur