Spantik-Sosbun Mountains La (5840 m/19,160 ft) separates the Barpu from the Chogo Lungma, and links the two ranges. On the southeast, the Braldu River separates the range from the somewhat lower Mango Gusor 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
K2 unable to keep pace. The mountain was first surveyed by a European survey team in 1856. Team member Thomas Montgomerie designated the mountain "K2" for being the second peak of the Karakoram range. The other peaks were originally named K1, K3, K4, and K5, but were eventually renamed Masherbrum, Gasherbrum IV, Gasherbrum II, and Gasherbrum I, respectively. In 1892, Martin Conway led a British expedition that reached "Concordia" on the Baltoro Glacier. The first serious attempt to climb K2 was undertaken in 1902 by Oscar Eckenstein, Aleister Crowley, Jules Jacot-Guillarmod, Heinrich Pfannl, Victor Wessely, and Guy Knowles via the Northeast