The rivière à la Carpe is a tributary of the eastern shore of the Métabetchouane River, in the administrative region of Saguenay–Lac-Saint-Jean, in the province of Quebec, in Canada.

The surface of the "rivière à la Carpe" (except the rapids zones) is usually frozen from the end of November to the beginning of April, however the safe circulation on the ice is generally done from mid-December to the end of March.

The main watersheds neighboring the "rivière à la Carpe" are: The Carp River takes its source at the mouth of Lac Neuf (length: 1.4 km (0.87 mi); altitude: 375 m (1,230 ft)).

From its source, the course of the "rivière à la Carp" descends on 20.2 km (12.6 mi), with a drop in level of 125 m (410 ft), according to these segments: From the confluence of the Carpe river, the current descends the Métabetchouane River north on 11.9 km (7.4 mi) to the south shore of Lac Saint-Jean; from there, the current crosses the latter on 22.8 km (14.2 mi) towards the northeast, then borrows the course of the Saguenay River via la Petite Landfill on 172.3 km (107.1 mi) until Tadoussac where it merges with the Saint Lawrence estuary.

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