The rivière aux Rats (English: Rats River) is a tributary of the Gulf of Saint Lawrence, flowing in the municipality of L'Île-d'Anticosti, in the Minganie Regional County Municipality, in the administrative region of Côte-Nord, in province of Quebec, in Canada.

[1][2] The Rats River has its source at the confluence of two mountain streams (altitude: 171 m (561 ft)), located in the south-central part of the island.

This source is located in a forest area at: From its source, the Rats River flows on 18.3 km (11.4 mi) with a drop of 170 m (560 ft), according to the following segments: The Rats River flows on the east side of Gand lac Salé, Petit lac Salé, Baie des Sables and the Côte de la Grande Traversée, on the south shore of Anticosti Island, in the gulf of Saint Lawrence.

The toponym "rivière aux Rats" was made official on September 12, 1974, at the Place Names Bank of the Commission de toponymie du Québec.

[3] In 1991, the Quebec government established the "Lac-Salé Ecological Reserve" covering approximately 7000 hectares.