The Saint-Pierre River is a tributary of the Mascouche River, flowing in the sector of "Saint-Janvier", in the city of Mirabel, in the region administrative Laurentides, in the southwest of Quebec at Canada.
This river runs eastwards an agricultural plain skirting the northern village of "Saint-Janvier".
Saint Pierre river rises between the Highway 15 and route 117, the northwest side of the village of Saint-Janvier. This source is located at:
Course of the river
From its source, the Saint-Pierre River flows on , according to the following segments:
The confluence of the Saint-Pierre River flows on the north bank of the Mascouche River, or west of the city limits of Sainte-Thérèse-de-Blainville.
The place name "Rivière Saint-Pierre" is of Christian origin. Two tributaries of the north bank of the Mascouche River are designated "Saint-Pierre River."
The place name "Saint-Pierre River" was formalized on August 8, 1977 at the "Banque de noms de lieux" (Bank of place names) of Commission de toponymie du Québec (Quebec Geographical Names Board).