Amundsen Glacier (85°35′S159°00′W) is a major Antarctic glacier, about 6 to 10 km (4 to 6 mi) wide and 128 km (80 mi) long, originating on the polar plateau where it drains the area to the south and west of Nilsen Plateau, and descending through the Queen Maud Mountains to enter the Ross Ice Shelf just west of the MacDonald Nunataks.