Beauharnois bōhär´nwä [key], city (1991 pop. 6,449), S Que., Canada, on Lake St. Louis, a broadening of the St. Lawrence River. Steel, aluminum, metal alloys, paper, chemicals, and furniture are produced in the city. Beauharnois is at the eastern outlet of the Beauharnois Canal, part of the St. Lawrence Seaway System, and is the site of a large hydroelectric development.

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