The Fourchette river flows through the municipalities of Saint-Sylvestre and Saint-Patrice-de-Beaurivage, in the Lotbinière Regional County Municipality, in the administrative region of Chaudière-Appalaches, in Québec, in Canada.

The main neighboring watersheds of the Fourchette river are: The Fourchette River has its source in the municipality of Saint-Sylvestre, at 1.9 kilometres (1.2 mi) northeast of the village center.

This headland is located north of route 216, 7.1 kilometres (4.4 mi) north of the summit of Mount Handkerchief and 4.0 kilometres (2.5 mi) south-east of the center of the village of Saint-Patrice-de-Beaurivage.

This confluence is located 2.7 kilometres (1.7 mi) upstream from the confluence of the Filkars River and 1.1 kilometres (0.68 mi) upstream from the "Route du Petit Lac" road.

The toponym "rivière Fourchette" was made official on August 8, 1977, at the Commission de toponymie du Québec.