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Show Our Deepest Chasm The deepest chasm in the United States and in continental North America is Hells canyon on the Snake river, directly along the border bor-der between Oregon and Idaho. This abyss, formed by the Wallowa Wallo-wa mountains of Oregon and the Seven Devils range in Idaho, is about 75 miles long. For over 40 miles it averages 5,510 feet in depth. At one point it is 7,900 feet deep, almost a mile and a half from rim to river, which exceeds by some 1,800 feet the 6,100-foot maximum for Grand canyon in Arizona. Pathfinder. |