The Zec de la Grande-Rivière is a "zone d'exploitation contrôlée" (controlled harvesting zone) (zec) in the unorganized territory of Mont-Alexandre, in Le Rocher-Percé Regional County Municipality, in administrative region of Gaspésie-Îles-de-la-Madeleine, in Quebec, in Canada. The economy of the territory of the ZEC is based primarily on fishing.