stacked rocks on a cliff of the grand canyon with the setting sun behind.

americans ancestral baaj camping canyon canyon–parashant caves channels cliff cliffs colorado cárdenas down-cutting earth39aph39s forest garcía geological geologists geology glen gorge grand gulch gully havasupai hiking history horseback hualapai indian inhabited kaibab kukveni landscape layer looking lópez monument mountain nation national native nature navajo nwaavjo park pine pines plant plateau preservation president pueblo ravine reservation ridge riding rim river rocks roosevelt scenery setting stacked standing sun sunset surrounding terrain theodore tourism tourist trail tributaries uplifted viewed widening wilderness