Emmons Glacier covers 4.3 square miles, the largest glacier by area on Rainier and in the contiguous United States. From the second platform, look for the river emerging from the dark, debris-covered ice front; that’s the terminus, even though the clean white ice seems to stop higher up. A 1963 rockfall from Little Tahoma spread debris across the lower glacier. The steep valley-edge ridges are older moraines left by Little Ice Age glaciers, and small milky-green ponds below formed among ice buried in older terminal moraines.