The Sunday River flows through the municipalities of Kinnear's Mills and Saint-Jacques-de-Leeds, in the Les Appalaches Regional County Municipality (MRC), in the region administrative office of Chaudière-Appalaches, in Quebec, in Canada.

The river, once a strong sinuosity, has a length of about 12 kilometres (7.5 mi) after linearization.

Also, the bed must be periodically freed from gravel deposits due to erosion.

The river is rich in brook trout, but linearization work has compromised the integrity of the [1] habitat.

Due to a lack of local manpower, the Governor James Henry Craig made build the way by the military.