This is part of the massive Bagley Icefield, the largest subpolar icefield in the world, that feeds many of the large glaciers in the area. Stretching over 125 miles, the Bagley Icefield and its associated glaciers fills a giant trough in the interior of the Chugach and St. Elias Mountains. For most of its length, this huge mass of ice measures over four miles wide. In some places it spans over 15 miles. Although the exact thickness is unknown, it probably exceeds 3,000' deep over most of its length. The icefield spills seaward in giant lobes at its west end, the Bering Glacier, and its east end, the Malaspina Glacier, each of which is roughly the size of Rhode Island.