It is a small river running through the territories of the cities of Magog and Sherbrooke, in the administrative region of Estrie, in Quebec, in Canada.

The total length of the river, including the portion of lac Magog, is therefore 31.8 kilometres (19.8 mi), on a drop of 67 metres (220 ft) and flows mainly along an axis south-west, north-east.

The significant drop allowed the construction of seven dams, three of which in the last 1,200 metres (3,900 ft) meters, even a gorge carved out by the river, in the heart of Sherbrooke.

One of them, that of the Paton Co. created the Lac des Nations, a water basin formerly intended to provide leeway during low-water periods, in order to allow the continuous functioning of industrial companies, which used the hydraulic power of the river.

Today, its banks are mainly occupied by private residences, by linear parks, or by a few areas still wooded, industrial activities having almost all disappeared.