Grottes de la Devèze-Roquebleue, Cave system in Courniou, France.
The Grottes de la Devèze-Roquebleue is a cave system featuring three distinct levels near Courniou. The chambers contain white mineral deposits and calcite formations that have naturally developed along the walls and within the passages.
Workers discovered the cave entrance in 1886 during railway construction in the area. The site was developed for public visits and opened to tourists by 1933 after initial explorations were completed.
The name reflects two cave systems that were eventually linked together through exploration. Today visitors walk through spaces shaped by mineral deposits that mark different chambers and passages.
Visitors follow guided tours through the middle level, where pathways are developed and suitable for walking. Access is available by the D612 road or via a converted railway path.
A chamber called Salle des Bijoux was discovered in 1929 and displays exceptional mineral formations in their natural state. These formations have been protected since and remain a special highlight of the visit.
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