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.
Geography.
Measuring long, the Arrats de devant originates in the Hautes-Pyrénées department in the commune of Betbeze, starting an elevation of . It flows into the Arrats at the commune of Bézues-Bajon in the "Lac de l'Astarac", ending at an elevation of .
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.
Main tributaries.
"(R) right bank; (L) left bank."