The Seudre (French pronunciation: [sødʁ]) is a river in the Charente-Maritime département, southwestern France, flowing into the Atlantic Ocean.

It flows northwest through Saint-André-de-Lidon, Saujon and La Tremblade.

It flows into the Atlantic Ocean near Marennes.

The lower course of the Seudre is brackish, and is used for oyster farming.

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