Rock climber in huge landscape, Three Sisters, Monument Valley, Navajo Reserve, Arizona/Utah, USA

america arizona buttes climbing deserts dusk erosion geography geology hot landscapes monument valley national monument monument valley national park mountaineering national parks natural phenomena nature navajo indian reserve navajo reserve north america outdoors people rock climbing rock formations scenics sport surface processes three sisters travel usa utah weathering leisure recreation extreme sports danger adventure exercise health fitness commitment challenge challenges evening twilight rocks