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The article presents the features of glacial origin in Montana and Idaho. The Rocky Mountain system in Montana and Idaho, between the Great plains on the east and the Columbia lava plateau on the west includes a number of ranges and plateau-like highlands of deformed crystalline and stratified rocks. Kootenai river, following the Rocky Mountain trench southeastward, turns southwestward just after crossing the international boundary, and thus for forty miles obliquely traverses the middle mountainous member, from which it escapes by turning a right angle into another oblique course of fifty miles to the western depression.