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Egrenne (rivière) walks
La Fosse Arthour in all its splendour
Passing through a marshland to discover this natural wonder – a gorge over 70 metres high, carved out by a river which, at this point, is more like a torrent – come and explore the Sonce and walk a short section ofthe GR® trail that links France’s two most spectacular sites: Notre-Dame Cathedral in Paris and Mont-Saint-Michel Abbey.