The rivière des Perdrix flows in the municipalities of Notre-Dame-du-Rosaire, Cap-Saint-Ignace and Montmagny, in the Montmagny Regional County Municipality, in the administrative region of Chaudière-Appalaches, in Quebec, in Canada.

The Rivière des Perdrix is a tributary of the south bank of the Bras Saint-Nicolas, which flows on the southeast bank of the rivière du Sud (Montmagny); the latter flows north-east to the south shore of the St. Lawrence River.

The main neighboring watersheds of the Perdrix river are: The Perdrix River has its source on the northern slope of the "Maple Mountain", on the northern slope of the Notre Dame Mountains, in the municipality of Notre-Dame-du-Rosaire.

Several branches of mountain and forest streams feed the head of the Perdrix River.

[1] The toponym Rivière des Perdrix was formalized on December 5, 1968, at the Commission de toponymie du Québec.