Spantik-Sosbun Mountains Spantik-Sosbun Mountains The Spantik-Sosbun Mountains are a subrange of the Karakoram range in Gilgit-Baltistan, Pakistan. The highest peak is Spantik, 7,027 m (23,054 ft). The other namesake peak is Sosbun Brakk, 6,413 m (21,040 ft). The Spantik-Sosbun Mountains are a narrow range, about 120 km (80 mi) long, trending roughly east-west. On the north, the range is bounded by the important Hispar and Biafo Glaciers, across which lie the Hispar Muztagh and Panmah Muztagh respectively. On the southwest, the Barpu Glacier and the longer Chogo Lungma Glacier separate the range from the Rakaposhi-Haramosh Mountains; the pass known as the Polan
K2 incorrectly showing that K2 was taller than Mount Everest, and therefore the tallest mountain in the world. A corrected measurement was made in 1987, but by that point the claim that K2 was the tallest mountain in the world had already made it into many news reports and reference works. The mountains of K2 and Broad Peak, and the area westward to the lower reaches of Sarpo Laggo glacier consist of metamorphic rocks, known as the "K2 Gneiss" and part of the Karakoram Metamorphic Complex. The K2 Gneiss consists of a mixture of orthogneiss and biotite-rich paragneiss. On the south