The Agout or Agoût (; ) is a long river in south-western France. It is a left tributary of the Tarn. Its source is in the southern Massif Central, in the Haut-Languedoc Regional Nature Park. It flows generally west through the following department and towns:
Hérault: La Salvetat-sur-Agout Tarn: Brassac, Castres, Lavaur, Saint-Sulpice
The Agout flows into the Tarn at Saint-Sulpice.
Among its tributaries are the Dadou, the Gijou and the Thoré.
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