The Rimouski River has its source at an altitude of 460 metres (1,510 ft) from the Miller Lake (length: 0.7 kilometres (0.43 mi)) located in Saint-Quentin Parish, Restigouche County, New Brunswick, in the Notre Dame Mountains.

The entrance to this road is open on 1.8 kilometres (1.1 mi) between the Northeast tip of the Saint-Barnabé Island and the platform of Rimouski city.

The watershed of Rimouski River covers an area of 1,635 square kilometres (631 sq mi) of which 98.6% are located in the Quebec and 1.4% in New Brunswick.

According to Mgr Louis-François Richer Laflèche, the name comes from the Mi'kmaq "animouski" and mean "mansion of dog".

As for the popular sense of land moose statement by Father Cyprien Tanguay, he would never have been accredited.

The most common species are the brook trout (Salvelinus fontinalis), the chub (Semotilus atromaculatus), the northern pearl dace (Margariscus nachtriebi) and the red shiner belly (Phoxinus eos).

The Atlantic salmon (Salmo salar) frequents on 29 kilometres (18 mi) downstream to breed.

[7] Four species of mammal live in the river: the Canadian beaver (Castor canadensis), the muskrat (Ondatra zibethicus), the river otter (Lontra canadensis) and the American mink (Neovison mink).