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salles souterraines naturelles". Arsip. "Histoire des explorations" (in French). Retrieved 18 September 2023. Haroun Tazieff (1952). Le gouffre de La
Pyrénées-Atlantiques in France. 660 metres (2,170 ft) of mined tunnel leads into the Salle de la Verna, the largest chamber in a show cave in the world. It has a diameter
de Saint-Émilion. Retrieved 4 April 2023. Michelle Gaborit, “L’église souterraine de Saint-Émilion” (Congrès archéologique de France, 145e session, Bordelais
Allard, D. Chigot and J-P Chevrier, Bassin versant de l'Echandon – Eaux souterraines et eaux superficielles (37), Bureau de recherches géologiques et minières
as early as 5,500 years ago. A portage along what is now the boulevard LaSalle was used to pass the Lachine Rapids. A trading post was established at