Bottleneck (K2) Bottleneck (K2) The Bottleneck is a location along the South-East Spur, known also as Abruzzi Spur— the most used route to the summit of K2, the second-highest mountain in the world, in the Karakoram, on the border of Pakistan and China. The Bottleneck is a narrow couloir, which is overhung by seracs from the ice field east of the summit. The couloir is located only 400m below the summit, and climbers have to traverse about 100m exposed to the seracs to pass it. Due to the height (8200m) and the steepness (50-60 degrees) this stretch is the most dangerous part
Central Karakoram National Park big sheer rock walls, and trek. Most expeditions visit the region in July and August, but some come as early as May and June, and September can be good for lower altitude climbing. One celebrated climbing area is Trango Towers, a group of some of the world tallest rock towers, situated in the park close to the route used to trek to the K2 base camp. Every year, a number of expeditions from all parts of the world visit the area to climb these most challenging granite towers. Central Karakoram National Park Central Karakoram National Park () is a national