CORNWALL, the capital of the united counties of Stormont, Dundas and Glengarry, Ontario, Canada, 67m. south-west of Mon treal, on the left bank of the St. Lawrence river. Pop. (193o) 11,126. It is an important station on the Canadian National, Canadian Pacific, and New York Central railways, and is a port of call for all steamers between Montreal and Lake Ontario ports. The surplus from the Cornwall canal furnishes excellent water privileges for its factories, which include cotton and woollen mills and grist and saw mills.