Trou du Diable, Underground cave system in Saint-Casimir de Portneuf, Quebec, Canada.
Trou du Diable is a cave system extending beneath Saint-Casimir de Portneuf with an underground stream flowing as a tributary to the Sainte-Anne River. The site has multiple chambers with varying ceiling heights and displays different patterns of water erosion on its walls and formations.
Early French settlers named the cave in the 17th century based on local legends about supernatural beings dwelling in its depths. The name reflects the mystery and fear that inhabitants connected to this underground place.
The site draws visitors who explore its passages on guided trips, learning how water shapes cave formations and the geology beneath their feet.
The cave is open to visitors from May to September, with a shorter standard route and a longer expedition option available. Booking ahead is advisable for the extended route, as the passages have different physical demands.
The chambers display rare vortex erosion patterns created by powerful water movement over millions of years. These geological features are clearly visible to visitors and make each section of the system look noticeably different.
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