[5] The population of Sept-Rivières RCM itself was 34,358,[4] of whom the vast majority live in the city of Sept-Îles.

[6] It is bordered by the regional county municipalities of Manicouagan, Caniapiscau, and Minganie, as well as by the southwest corner of Labrador and by the Gulf of Saint Lawrence.

It allegedly takes its name from seven major rivers that join the Saint Lawrence within the territory: Moisie, Sainte-Marguerite, Trinité, Pentecôte, aux Rochers, Pigou and Manitou.

There are a number of large rivers that flow in a generally north-south direction through Sept-Rivières to enter the Gulf.

From west to east, the larger river basins, which may cover parts of neighboring regions, are:[9]