The river Boulogne () is located in western France in the départements Loire-Atlantique and Vendée. It is in length and flows north from the source near Saint-Martin-des-Noyers, through Les Essarts and La Merlatière, then through Boulogne, Vendée and Les Lucs-sur-Boulogne into the Lac de Grand-Lieu. This lake is drained by the river Acheneau towards the Loire. References Rivers of France Rivers of Pays de la Loire Pays de la Loire region articles needing translation from French Wikipedia Rivers of Loire-Atlantique Rivers of Vendée