The Dadou () is a long river in the Tarn department in southern France. Its source is near Saint-Salvi-de-Carcavès. It flows generally west. It is a right tributary of the Agout, into which it flows near Ambres.
Communes along its course The Dadou flows west, crossing the Tarn department, through the following communes, ordered from source to mouth:
Saint-Salvi-de-Carcavès Le Masnau-Massuguiès Lacaze Paulinet Rayssac Mont-Roc Teillet Le Travet Arifat Saint-Antonin-de-Lacalm Montredon-Labessonnié Saint-Lieux-Lafenasse Vénès Réalmont Saint-Genest-de-Contest Lombers Laboutarie Montdragon Saint-Julien-du-Puy Graulhet Briatexte Saint-Gauzens Puybegon Giroussens Ambres
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