Rivière Jupiter is the crown jewel of Anticosti Island's salmon rivers and one of the most celebrated Atlantic salmon fisheries in the world. Stretching 79 kilometers in length and draining a vast watershed of approximately 970 square kilometers, this remarkable river is fed by 10 tributaries and originates in a series of lakes and ponds near the center of the island before carving its way through a dramatic canyon with sheer cliff walls reaching up to 100 meters in height. The river empties into Bonsecours Bay on the south shore of Anticosti Island, in the Gulf of St. Lawrence, roughly 80 kilometers east of the village of Port-Menier. Anticosti Island itself is part of the Minganie Regional County Municipality in Quebec's North Shore region, accessible only by boat or plane. The Jupiter's turquoise, crystal-clear waters are legendary — so transparent that Atlantic salmon are often visible from the surface, making fishing here an extraordinarily visual and captivating experience. The riverbed is composed primarily of pebbles and cobbles, providing ideal habitat for salmon. Flow is moderate in the upper reaches and becomes more rapid in the lower sections. The Société des établissements de plein air du Québec (Sépaq) manages the river and has developed a network of cabins and services to accommodate visiting anglers and tourists.