Photo - Galerie Mine d'Orpierre Nord
© Curieux de Découvertes · CC BY-SA 3.0, https://creativecommons.org/licenses/by-sa/3.0/ · Grottocenter: Mine Orpierre, galerie nord · https://grottocenter.org/ui/documents/231365
Contains information from Grottocenter (Wikicaves), grottocenter.org, made available under the Open Database License (ODbL 1.0, https://opendatacommons.org/licenses/odbl/1-0/), modified. · The derived data is available on request under the ODbL: [email protected] · data as of 2026 · Source: Grottocenter (Association Wikicaves), worldwide collaborative cave database (grottocenter.org), modified. CC BY-SA 3.0, https://creativecommons.org/licenses/by-sa/3.0/ Grottocenter (Wikicaves) · Text by Curieux de Découvertes (Description sommaire), Curieux de Découvertes (Situation de l'entrée de la galerie) · https://grottocenter.org/ui/entrances/137840 · data as of 2026