The Sainte-Marguerite River is a river flowing in the unorganized territory of Mont-Valin, Le Fjord-du-Saguenay Regional County Municipality, in Quebec, in Canada. This river is a tributary of the Saguenay River.
The name appeared on the map of the domain of the king's father Laure in 1731. It is also applied to the bay and cape located near its mouth
Sainte-Marguerite River begins its course of in Sainte-Marguerite Lake at an altitude of . This lake is recuperating water of many water bodies at West of Mont-Valin (), in the zec Martin-Valin.
Then, the river flows in north-westerly direction for a few kilometers before turning southwest on and turns sharply to the southeast. It then goes along the Saguenay River on about . In final step of it course, the river turn toward South-West for a final before flowing into the Sainte-Marguerite Bay at sea level. The entry of this bay (with a length of and of maximum width) is located at (by the river) upstream of the Tadoussac ferry.
The main tributaries are "la Petite rivière Sainte-Marguerite nord-est", "la rivière Valin" and "le Bras des Murailles" (including it tributary "le ruisseau Couture"). The main creeks which are tributaries of "Sainte-Marguerite River" are: Barre, ÃÂpiphanie, ÃÂpinette and "de la Cage".
The course of Sainte-Marguerite River cross many rapids, such as (from the upper part of the river):