The Saint-Maurice River flows North to South in central Quebec from Gouin Reservoir to empty into the Saint Lawrence River at Trois-Rivières, in province of Quebec, in Canada. From its source at Gouin Reservoir, located at the same latitude as the Lac Saint-Jean, the river has a total drop of about 405 meters, to finally reach the river Trois-Rivières. The river is 563 km in length and has a drainage basin of 43,300 km² . Saint-Maurice river is one of the most important tributaries of St. Lawrence river.
Between Weymontachie and Trois-Rivières, the St-Maurice River has 27 tributaries identified as significant enough for downhill wood: Weymontachingue, Manouane, Little Rock, Little Flamand, Windigo, Flamand, Coucoucache, Grande Pierriche , Petite Pierriche , "La Trenche", Vermillion, Croche, Rivière-au-Lait, Bostonnais, Little Bostonnais, Small Stream, Mountain, Caribou, Rivière-aux-Rats, Wessonneau, Little Batiscan River, l'Oiseau , Bête Puante , Mattawin, Mekinac, River "au Lac des Pêches" and Shawinigan River.
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