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Ponor of the Risle near La Ferrière-sur-Risle.
|Length||145 km (90 mi)|
|- average||14 m3/s (490 cu ft/s)|
|Progression||Seine→ English Channel|
|Basin size||2,310 km2 (890 sq mi)|
The river begins in the Orne department west of L'Aigle, crosses the western part of the department of Eure flowing from south to north and out into the estuary of the Seine on the left bank near Berville-sur-Mer. Its upper valley is part of the Pays d'Ouche, its lower valley separates the regions of the Lieuvin and Roumois.
The Risle is regarded as a coastal river. Fishing is common downstream at Pont-Audemer.
Its only major tributary is the Charentonne. The Risle flows through the following departments and communes:
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