The Rivière Saguenay is one of Quebec's most remarkable and ecologically complex waterways, stretching through the dramatic Saguenay–Lac-Saint-Jean region and carving through ancient fjord landscapes before meeting the St. Lawrence. What makes this river truly extraordinary from an angler's perspective is its dual nature: it functions simultaneously as a river and a fjord, creating two entirely distinct aquatic habitats layered one atop the other. At the surface, brackish water — fed primarily by the freshwater outflow of Lac Saint-Jean — supports anadromous species like Atlantic salmon and sea trout. In the depths, dense saltwater flowing in from the estuary harbors marine species including Atlantic cod, redfish, and Greenland halibut. This rare combination makes the Saguenay a destination unlike virtually any other in Canada, drawing anglers from across the country and beyond to experience its diverse fishery across all seasons.