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... the hydrographic system of the Great Lakes–St. Lawrence is the world’s 13th largest watershed (area of 1 610 000 km2) and the third largest in North America, after the Mississippi and Mackenzie rivers? [More...]
... the Great Lakes–St. Lawrence hydrographic system ranks 16th in the world for its mean annual flow of 12 600 m3/s near Quebec City? [More...]
... at 3260 km long from Lake Superior to the Cabot Strait, the Great Lakes–St. Lawrence hydrographic system ranks 17th in the world? [More...]
... the effluent of the City of Montreal is responsible for releasing as much as 22 kg of pharmaceutical products into the St. Lawrence River every year?
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