The Stubai Alps (in German Stubaier Alpen) is a mountain range in the Central Eastern Alps of Europe. It derives its name from the Stubaital valley to its east and is located southwest of Innsbruck, Austria. Several peaks form the border between Austria and Italy. The range is bounded by the Inn River valley to the north; the Sill River valley (Wipptal) and the Brenner Pass to the east (separating it from the Zillertal Alps); the Ötztal and Timmelsjoch to the west (separating it from the Ötztal Alps), and to the south by tributaries of the Passer River and Eisack. Geography Important parts of the Stubai Alps show signs of glaciation. The northern part around the Sellrain valley and the Kühtai is now only lightly glaciated and a popular ski touring destination (Zischgeles, Lampsenspitze, Pirchkogel, Sulzkogel). The High Stubai around the upper Stubai valley is still heavily glaciated and a classic high mountain touring region in the Eastern Alps. Here there is a glacier ski area on the Stubai Glacier. Together with the Ötztal Alps to the west, with which they are linked by the saddle of Timmelsjoch, the Stubai Alps form one of the biggest mountain blocks of the Eastern Alps. Boundary and neighbouring mountain groups In the Alpine Club classification of the Eastern Alps (AVE) the Stubai are no. 31. Their boundary follows the following line: in the north, it follows the course of the River Inn in the northwest, it follows the Inn from its confluence with the Ötztaler Ache (near Ötztal railway station) to the confluence with the Gurglbach (near Imst), then to the Mieming Chain (AVE 4) in the Northern Limestone Alps in the north, it follows the River Inn to Innsbruck, which divides the Stubai Alps from the Karwendel (AVE 5) in the Northern Limestone Alps in the east, it is formed by the Wipptal valley: in the northeast it follows the Sill to its confluence with the Schmirnbach (Schmirntal) near St. Jodok, opposite the Tux Alps (AVE 33) in the southeast, it follows the Sill to the Brenner Pass – Eisack to Sterzing, which separates the Stubai Alps from the Zillertal Alps (AVE 35) in the south it follows the lower Ridaunbach – Jaufenbach (Jaufental) – Jaufen Pass – St. Leonhard in Passeier, a line which divides it from the Sarntal Alps (AVE 32, which are counted as part of the Central Eastern