LeConte Glacier in the Stikine Icefield is one of the few remnants of the once-vast ice sheets that covered much of North America during the Pleistocene, or Ice Age. LeConte covers 2, 900 square miles along the crest of the Coastal Mountains and since first charted in 1887, it has retreated almost 2.5 miles but is considered stable; Stikine Icefield, Alaska, United States of America