The Yon is a Affluent Lay, the principal coastal river of the department of the the Vendée.
Yon takes source between the commune of the Tool bag and that of Saint-Martin-of-Walnut trees. It crosses Dompierre-on-Yon and returns in the water reserve of Mill-Papon, which feeds the town of the Roche-sur-Yon out of drinking water.
The river finishes its course on the commune of the Field-Saint-Father, near the Noailles locality, while being thrown in the Lay.
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