Lake Saint-Louis is a lake in southwestern Quebec, Canada, at the confluence of the Saint Lawrence and Ottawa Rivers. The Saint Lawrence Seaway passes through the lake. Lake St. Louis is a widening of the St. Lawrence River in the Hochelaga Archipelago. It is also fed by the Ottawa River via the Lake of Two Mountains at Sainte-Anne-de-Bellevue, the Beauharnois Canal, the Soulanges Canal, the
Saint-Louis River, and the Châteauguay River. The lake is bounded to the north and the east by the Islan…