Southwest of the Zugspitze, between the Zugspitzeck and Schneefernerkopf, is the Northern Schneeferner which has an eastern aspect. With an area of 30.7 hectares (2006) it is the largest German glacier. Around 1820 the entire Zugspitzplatt was glaciated, but of this Platt Glacier (Plattgletscher) only the Northern and Southern Schneeferner remain. The reason for the relatively constant area of the Northern Schneeferner in recent years, despite the lack of shade, is the favourable terrain that results in the glacier tending to grow or shrink in depth rather than area. In the recent past the glacier has also been artificially fed by the ski region operators, using piste tractors to heap large quantities of snow onto the glacier in order to extend the skiing season.