The Arrats is a long river in southern France, left tributary of the Garonne. Its source is in the northern foothills of the Pyrenees, near Sariac-Magnoac. It flows north through the following départementss and towns:

• Hautes-Pyrénées

• Gers: Castelnau-Barbarens, Aubiet, Mauvezin, Saint-Clar

• Tarn-et-Garonne: Saint-Loup

It flows into the Garonne near Valence, between Castelsarrasin and Agen.

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