The Oison is a small river in the Eure department, Normandy, France. It is a left tributary of the Seine. Its source is in the commune of Saint-Amand-des-Hautes-Terres, and it flows into the Seine near Saint-Pierre-lès-Elbeuf. Its total length is 16 km (10 mi).

Val d'Oison

Eight villages in the valley of the Oison (Val d'Oison) are twinned with the civil parish of Clanfield, United Kingdom.

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