Bourne Gorges 
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Beyond Villard-de-Lans D531 runs down into the Bourne valley, which narrows into the Gorges de la Bourne, a tremendous rocky defile in which the road is carried through tunnels and over bridges. Between Choranche and Pont-en-Royans two interesting caves can be reached from the road, the Grotte du Bournillon and the Grottes de la Choranche (in which is an underground lake).
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Walkway at Gorges de la Bourne.
A river through Gorges de la Bourne.
