The Bas-Saint-Laurent, is an administrative region of Quebec located along the south shore of the lower Saint Lawrence River in Quebec. The river widens at this place, later becoming a bay that discharges into the Atlantic Ocean and is often nicknamed "Bas-du-Fleuve" (Lower-River). The region is formed by eight regional county municipalities and 114 municipalities. In the south, it borders Maine of the United States, and the Canadian New Brunswick and the regions of Chaudière-Appalaches and Gaspésie–Îles-de-la-Madeleine.

The Matapedia Valley was formed by the Chic-Choc Mountains of eastern Québec. Its name is derived from the river that traverses the valley, as well as the lake that lies in its center. It is situated in the southwest of the Gaspé Peninsula and stretches 375 km (233 mi).