Ruth Glacier, Alaska Range, Denali National Park, USA.

Fly over Ruth Glacier and the Alaska Range in Denali National Park and Preserve, Alaska, USA. See a vast wilderness of glaciers, icy peaks, and mile deep granite gorges. Denali (20,310 feet or 6191 meters, aka Mount McKinley) is a granitic pluton uplifted by tectonic pressure while erosion has simultaneously stripped away the softer sedimentary rock above and around it.