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 between oregon and idaho this abyss formed by the wallo wa mountains of oregon and the seven devils range in idaho is about 75 miles long for over 40 miles it averages feet in depth at one point it is feet deep almost a mile and a half from rim to river which exceeds by some 1800 1600 feet the foot maximum for grand canyon in arizona pathfinder |