| Trenche River | |
|---|---|
 | |
 Main tributaries of Saint-Maurice River | |
| Native name | La Trenche (French) |
| Location | |
| Country |  Canada |
| Province |  Quebec |
| Region | Mauricie |
| Physical characteristics | |
| Source | |
| • coordinates | 48°21′15″N 74°06′00″W / 48.35417°N 74.10000°W |
| Mouth | Saint-Maurice River |
• coordinates | 47°49′48″N 72°51′42″W / 47.83000°N 72.86167°W |
| Length | 150 km (93 mi) |
The Trenche River (commonly named “La Trenche” in French) flows in a southwesterly direction through two forested areas. The first is the unorganized territory of Lac-Ashuapmushuan, in the MRC Le Domaine-du-Roy Regional County Municipality, administrative region of Saguenay-Lac-Saint-Jean. Secondly, within La Tuque (urban agglomeration), Upper Mauricie, Quebec, Canada. This river is one of the five most important tributaries of the Saint-Maurice River.