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The défilé d'Entre-Roches is a canyon or gorge of the upper Doubs in the department of Doubs in eastern France.
Map of D%C3%A9fil%C3%A9 d'Entre Roches, 25650 La Longeville, France
It extends about 30 km along departmental highway 437 between Pontarlier and Morteau.
References
Défilé d'Entre-Roches Wikipedia(Text) CC BY-SA