The Grossglockner (German: Großglockner or just Glockner, Slovene: Veliki Klek) is, at 3,798 metres above the Adriatic (12,461 ft), the highest mountain of Austria and the highest mountain in the Alps east of the Brenner Pass. It is part of the larger Glockner Group of the Hohe Tauern range, situated along the main ridge of the Central Eastern Alps and the Alpine divide. The Pasterze, Austria's most extended glacier, lies on the Grossglockner's eastern slope. The characteristically pyramid-shaped peak actually consists of two pinnacles, the Grossglockner and the Kleinglockner (3,770 m (12,370 ft), from German: klein, "small"), separated by a saddle-like formation known as the Glocknerscharte.
The name Glocknerer is first documented in a 1561 map designed by the Vienna cartographer Wolfgang Lazius. The denotation Glogger is mentioned a 1583 description of the Tyrolean Kals legal district, then referring to the whole ridge south of the Alpine main chain. In the 1760s, the Atlas Tyrolensis listed a Glockner Berg, the prefix Gross- ("great") is not mentioned before the first expedition in 1799.