The Loups Marins River rises on the Canadian Shield and flows south to the Saint Lawrence.

[4] A wooden cross standing on the rocks marks the western entrance to the river's estuary, which has about 3 metres (9.8 ft) of water.

[7] A map of the ecological regions of Quebec shows the river in sub-regions 6j-T and 6m-T of the east spruce/moss subdomain.

[8] The hoary bat (Lasiurus cinereus), suspected of being threatened or vulnerable in the province, was observed between 1999 and 2000 in a forest of firs and alders on the west side of the Loups Marins River.

[9] The 9.18 square kilometres (3.54 sq mi) Waterfowl concentration area of Rivière aux Loups Marins, Île de la Grande Anse, designated an IUCN Category IV Water fowl gathering area in 1998, covers the east part of the river's estuary and the coastline east to the Île de la Grande Anse.