The Lignon () is a long river in the Ardèche département, southern France. Its source is at La Souche, in the Parc naturel régional des Monts d'Ardèche. It flows generally east-northeast. It is a right tributary of the Ardèche into which it flows between Meyras and Pont-de-Labeaume.
Communes along its course This list is ordered from source to mouth: Ardèche: La Souche, Jaujac, Fabras, Meyras, Pont-de-Labeaume
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