The Aulnaies River rises at the mouth of Carufel Lake (length: ; altitude: ) in the township of Brassard, in the municipality of Saint -Michel-des-Saints. This lake is located on the southwest side of a mountain whose summit reaches . The mouth of this Carufel lake is located southeast of the confluence of the Aulnaies river, northwest of the village center from Saint-Michel-des-Saints and south-east of the mouth of the Taureau reservoir. From the mouth of Carufel Lake, the Aulnaies river flows over , according to the following segments: • south-east, in the township of Brassard, crossing Lac Brod (length: ; altitude: ) over its full length and Lake Saint-Martin (length: ; altitude: ), to the mouth; • north-east, to the outlet of Lac du Trèfle (coming from the north-west); • towards the northeast, crossing Lac Beaulieu (length: ; altitude: ) at the end of the segment, to the mouth; • northwards, to the limit of the township of Laviolette; • north-east in the Laviolette canton by cutting a forest road, until the confluence of the river. The Aulnaies river flows into the canton of Laviolette, on the southwest bank of the Middle river. The confluence of the Aulnaies river is located at: • downstream of the confluence of the
Laviolette River; • north-west of the center of Saint-Michel-des-Saints; • west of the mouth of the Taureau Reservoir; • west of the confluence of the Matawin river. == Toponymy ==