Ice caps are miniature ice sheets, covering less than 50,000 square kilometers (19,305 square miles). They form primarily in polar and sub-polar regions that are relatively flat and high in elevation. To see the difference between an ice cap and an ice sheet, compare Iceland and Greenland on a globe or world map. The much smaller mass of ice on Iceland is an ice cap.

Greenland is almost completely covered by a large ice sheet and its outlet glaciers. By comparison, Iceland (near the bottom center of this image) is a much smaller land mass, and features ice caps and glaciers. —Credit: Arctic Climate Research group at the University of Illinois

Iceland’s Vatnajökull Ice Cap is the largest in Europe. The ice cap is an average of 400 meters (1,300 feet) thick, and covers about 8,100 square kilometers (3,127 square miles). —Credit: Photographer and date unknown. Courtesy NASA