Fort des Prairies, a name applied at different times to various fur-trading posts, among them Fort à la Corne, Fort Augustus, Fort La Jonquière, and Fort aux Trembles on the Saskatchewan river. The name Lower Fort des Prairies was later applied to Fort Vermilion, and the name Upper Fort des Prairies to Fort Augustus.

Source : W. Stewart WALLACE, ed., The Encyclopedia of Canada, Vol. II, Toronto, University Associates of Canada 1948, 411p., p. 367.