Of the federal electoral districts located in Ontario it is the largest by land mass, and the smallest by population. It encompasses most of Kenora District except for the eastern third, and a small section of the northwest corner of Thunder Bay District. It includes many remote First Nations reserves of extreme Northern Ontario. It succeeds the former federal riding of Kenora—Rainy River.
It consists of the part of the Territorial District of Kenora lying west of a line drawn due north from the northeast corner of the Territorial District of Thunder Bay (Albany River) to Hudson Bay; and the part of the Territorial District of Thunder Bay lying northwest of a line drawn east from the western limit of the territorial district along the 6th Base Line, north along eastern limit of the townships of Bertrand, McLaurin, Furlonge, Fletcher and Bulmer, and due north to the northern limit of the territorial district.