The Landroche River is a tributary on the south shore of Lake Saint-Pierre which is crossed to the northeast by the St. Lawrence River. The Landroche river flows in the municipality of Baie-du-Febvre, in the Nicolet-Yamaska Regional County Municipality (MRC), in the administrative region of Centre-du-Quebec, in Quebec, in Canada.
The main neighboring hydrographic slopes of the Landroche river are:
The Landroche river draws its source from agricultural streams located in the territory of the municipality of Baie-du-Febvre, almost at the limit of Saint-Elphège. The Landroche river begins at the confluence of the Roland-Lemire stream and the Geoffroy stream. This confluence is located on the municipal boundary of Saint-Elphège and Baie-du-Febvre.
From its source, the course of the Landroche river flows on towards the north-west, generally in an agricultural zone, with a drop of . The course of the river intersects Chemin du Pays-Brûlé, route 132 and Chemin des Huit.
The Landroche River flows northwest in an agricultural zone, crossing route 132. The river empties on the flats of Pierre ÃÂ Chaux on the south shore of Lake Saint-Pierre, near Pointe Gabriel, north-east of the village of Baie-du-Febvre.
The toponym "rivière Landroche" was made official on August 8, 1980, at the Commission de toponymie du Québec.