Le défilé du Portalet et le verrou glaciaire - Sortie CPIE

A hydroelectric power station and its penstocks; a fort clinging to a massive limestone cliff containing coral fossils some 300 million years old; a railroad with its tunnels and viaducts; a footbridge suspended over the Gave... so many infrastructures installed in the mountains in a particularly narrow defile linked to a glacial lock!

From age 8 - Intermediate walker.