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Flowing northward, the Snake River hastens to drop into Hell's Canyon, the deepest river gorge in the United States. This mountainous gorge forms the border between Oregon and Idaho, and part of Washington. Through Hell's Canyon you'll encounter set after set of large, voluminous rapids, Nez-Perce petroglyphs, homesteads, and wildlife of all sorts. The Salmon River combines with the Snake River and shortly after, the trip ends.