The Arrats de devant, sometimes called the Petit Arrats (little Arrats), is a river in southern France and a sub-tributary of the Garonne via the Arrats.

[1] Measuring 14.1 km (8.8 mi) long,[1] the Arrats de devant originates in the Hautes-Pyrénées department in the commune of Betbeze, starting an elevation of 387.05 m (1,269.8 ft).

[2] It flows into the Arrats at the commune of Bézues-Bajon in the Lac de l'Astarac, ending at an elevation of 237.51 m (779.2 ft).

[2] Lac de l'Astarac is formed from two forks, creating a Y-shape.

The east fork is the Petit Arrats, while the west fork is formed by the upstream part of the Arrats.