effluent cave, Goule noire, entrance, France, Vercors

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Photo credit: © blickwinkel/Wisshak / Alamy / Afripics
License: Licensed
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Keywords: ., biotope, biotopes, cave, cavern, caverns, caves, caving, effluent, entrance, entrances, europe, european, france, french, geology, goule, landscape, landscapes, noire, outlook, research, river, rivers, running, spelaeology, speleology, vercors, water, waters, western, wisshak