Matawin river's main source is lake Matawin in
Rouge-Matawin Wildlife Reserve, in Charland Township, about 8 miles southwest of Lake Charland, which is created by an expansion of "Rivière-du-milieu. Matawin ouest river flows prior to the South and cross many lakes up to the boundary of
Mont-Tremblant National Park. Then the river goes toward East up to the village of
Saint-Michel-des-Saints). The river empties into a large bay, in the village, at the south of the western part of
réservoir Taureau (Taureau Reservoir).
Lac-Taureau is an unorganized part of the
Matawinie Regional County Municipality, which is part of the administrative region of
Lanaudière territory. From the discharge of the latter lake, Matawin river continues its course by flowing Eastward. Finally, the river flows into the
Saint-Maurice River approximately midway between
La Tuque and
Grand-Mère. The mouth of Matawin River is located one kilometer south of Matawin Island located in the middle of Saint-Maurice River. Between
Taureau Reservoir and Saint-Maurice River, Matawin River forms the northern boundary of the
La Mauricie National Park. == Toponymy ==