Lac Saint-Jean is a very large lake in the Saguenay-Lac-Saint-Jean region of Quebec, described as so big it feels like an ocean and noted as the third largest lake in Quebec. It is located upstream from the Saguenay River and is fed by several major rivers, including the Péribonka, Ashuapmushuan, Petite rivière Péribonka, and Métabetchouane. The lake is connected to the dramatic Saguenay Fjord, a 105-kilometer-long fjord with cliffs up to 300 meters high where freshwater from the lake meets saltwater from the St. Lawrence estuary. Paddling on Lac Saint-Jean offers a wide-open water experience, with the surrounding region known for stunning scenery and a kicked-back, small-town lifestyle in villages like L'Anse-Saint-Jean. The lake is popular for stand-up paddleboarding and kayaking, with rentals available, and is considered accessible for beginners and experienced paddlers alike, though knowing how to swim is compulsory. Numerous access points, marinas, and launching facilities are available around the lake, including specific locations like the Dam-en-Terre marina near Alma, which offers a launch ramp, docks, and boater services. Other noted launch points include Parc Octopus in Desbiens, the Club Nautique de Roberval in Roberval, and the Port de plaisance d'Alma in Alma. The best season for paddling activities in the broader region runs from May to October. While on the water, paddlers may share the environment with various users and are advised to respect speed limits, demarcation buoys, and wildlife, and to dispose of garbage responsibly. The connected Saguenay Fjord is a protected area within the Saguenay-St. Lawrence Marine Park, where paddlers might observe beluga whales, seals, and porpoises, though these marine species are more associated with the fjord's saltwater sections than the freshwater lake itself.