The Carpe River is a tributary of Petite rivière Eusèbe, flowing in the unorganized territory of Lac-Ashuapmushuan and the municipality of Saint-Félicien, in the Le Domaine-du-Roy Regional County Municipality, in the administrative region of Saguenay–Lac-Saint-Jean, in the province from Quebec, to Canada.

The surface of the Carp River is usually frozen from the beginning of December to the end of March, except the rapids areas; however, safe traffic on the ice is generally from mid-December to mid-March.

The Carpe river originates in Lake Eusèbe (length: 0.7 km (0.43 mi); altitude: 267 m (876 ft)) in the forest area in the western part of Saint-Félicien, in the unorganized territory of Lac-Ashuapmushuan.

This source is located at: From its source, the Carp River flows over 16.0 km (9.9 mi) with a drop of 147 m (482 ft), crossing a few forest islets in the upper part, then agricultural for the rest of the course, according to the following segments: The Carp river flows on the south bank of the Petite rivière Eusèbe.

[2] The toponym "rivière à la Carpe" was formalized on December 5, 1968, at the Place Names Bank of the Commission de toponymie du Québec.