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A city of southwest Ontario, Canada, on Thunder Bay, an inlet on the northwest shore of Lake Superior. A major port and industrial center, it was created in 1970 by the amalgamation of the twin cities of Port Arthur and Fort William.
(Placename) a port in central Canada, in Ontario on Lake Superior: formed in 1970 by the amalgamation of Fort William and Port Arthur; the head of the St Lawrence Seaway for Canada. Pop: 103 215 (2001)