There are 25 major glaciers on Mount Rainier and numerous unnamed snow or ice patches, which cover about 35 square miles (90 km2). Mount Rainier's glaciers are important indicators of climatic change and essential sources of water, supporting five major river systems. The Emmons Glacier has the largest area (4.3 square miles) and the Carbon Glacier has the lowest terminus altitude (3,600 feet) of all glaciers in the contiguous 48 states.
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