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© Peter Smith · CC BY-NC-SA (version not stated by the source), https://www.karsteau.org/karsteau/index.php · Karsteau: collusa 0003.jpg · https://www.karsteau.org/karsteau/recherche/entree/recherche_entree.php?entree=37596

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Source: Karsteau (Fédération Française de Spéléologie et Canyon) (www.karsteau.org), modified. CC BY-NC-SA (version not stated by the source), https://www.karsteau.org/karsteau/index.php Karsteau (Fédération Française de Spéléologie et Canyon) · data as of 2026