spring in yellowstone: morning sun fills the grand canyon of the yellowstone river as we look downriver from the north rim trail

background caldera canyon cliff day downriver environment erosion evergreen fills forest geology gorge grand green horizon hydrothermal landscape late look morning national natural nature north nps outdoor panorama park rhyolite rim river rock roiling scenery scenic shimmering sky spring sun sunlight sunny the tourism trail travel trees view water wilderness wyoming yellowstone