The Montmorency River is a tributary of North-East bank of St. Lawrence river, flowing in the administrative region of Capitale-Nationale, in the province of Quebec, Canada. The course of the river successively crosses the regional county municipality of:MRC La Côte-de-Beaupré Regional County Municipality: Lac-Jacques-Cartier, Château-Richer, L'Ange-G…The Montmorency River is a tributary of North-East bank of St. Lawrence river, flowing in the administrative region of Capitale-Nationale, in the province of Quebec, Canada. The course of the river successively crosses the regional county municipality of:MRC La Côte-de-Beaupré Regional County Municipality: Lac-Jacques-Cartier, Château-Richer, L'Ange-Gardien, Boischatel; MRC La Jacques-Cartier Regional County Municipality: Sainte-Brigitte-de-Laval Agglomération de Québec.