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The Chaos of the Chéran, the Bridge of the Abyss

From the footbridge at Cusy, take the right bank up the Chéran gorges and the left bank down after crossing the spectacular "Pont de l'Abîme". This well-maintained itinerary allows you to discover the wildest part of one of Europe's last natural rivers.
Chalet du Trousset via the Sentier des Renards
Right from the start, there is a steep climb from Cusy to reach the Chalet du Trousset. The route then mostly follows beautiful trails and paths through the woods, offering lovely views in places.
The Visorando app is highly recommended.