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L'Isle-Arné (Gers, Fr) moulin sur un bras de l'Arrats.JPG
The river in L'Isle-Arné
Country France
Main source Plateau de Lannemezan
River mouth Garonne
44°5′42″N 0°50′48″E / 44.09500°N 0.84667°E / 44.09500; 0.84667Coordinates: 44°5′42″N 0°50′48″E / 44.09500°N 0.84667°E / 44.09500; 0.84667
Progression GaronneAtlantic Ocean
Physical characteristics
Length 162 km (101 mi)

The Arrats is a 162 km 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 départements and towns:

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

The Arrats flowing into the Réservoir de l'Astarac