Glaciers cover one million acres, or one-sixth of Denali National Park. Like the many arms of an octopus, glaciers flow away from the mountains transporting hundreds of thousand of tons of ice each year. This ice eventually melts in the lower reaches of the glaciers and rapidly fills rivers with turbulent muddy water that flows into the oceans. The iconic image of a glacier calving ice chunks into the ocean cannot be seen here - these glaciers are more distant and rougher, eking out an existence high in the Alaska Range.