FORT WILLIAM, the principal city of Thunder Bay dis trict, Ontario, Canada, 426 m. (by rail) E.S.E. of Winnipeg, on the Kaministiquia river, about a mile from Lake Superior. It is on the Canadian Pacific and Canadian National railways, and served by several steamship lines. Port Arthur lies 4 m. to the N.E. Fort William contains numerous grain elevators, railway repair shops and docks, paper and wood pulp mills, and has a large export trade in grain and other farm produce. Minerals are also exported from the mining district, of which it is the centre. Industries, such as saw, planing and flour mills, have also sprung up. Pop.