The estuary of the St. Lawrence River is located downstream of the St. Lawrence River and upstream of the Gulf of St. Lawrence. It refers to the place where the fresh and salt waters mix between the river and the gulf. The St. Lawrence Estuary begins at Lake Saint-Pierre and ends at the widening of the shores, at the height of Pointe-des-Monts, Quebec. It is divided into three sections: the St. Lawrence River estuary at Île d'Orléans , the middle estuary to the Saguenay Fjord, the maritime estuary to Pointe-des-Monts, Quebec. It is the largest estuary in the world.
The St. Lawrence Estuary is characterized by a saline front at the eastern tip of Île d'Orléans. The zone of contact between fresh and salt water corresponds to a region of high concentrations of suspended matter causing a zone of maximum turbidity of a length that can vary from 70 to 120 kilometres , depending on the flow of the river. This zone of maximum turbidity is located between Île d'Orléans and Île aux Coudres . The mechanisms of estuarine circulation associated with this environment make it a privileged site of primary and secondary production which shelters many fish nurseries. High environmental turbidity provides shelter against predators while larvae are maintained under optimum temperature and salinity conditions. Large variations in salinity and turbidity result in a wide variety of physicochemical conditions and planktonic communities on the river.
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