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
Gilgit-Baltistan Highway (KKH), which was completed in 1978. The Karakoram Highway connects Islamabad to Gilgit and Skardu, which are the two major hubs for mountaineering expeditions in Gilgit-Baltistan. The journey from Rawalpindi/Islamabad to Gilgit takes approximately 20 to 24 hours. Landslides on the Karakoram Highway are very common. The Karakoram Highway connects Gilgit to Tashkurgan Town, Kashgar, China via Sust, the customs and health-inspection post on the Gilgit-Baltistan side, and the Khunjerab Pass, the highest paved international border crossing in the world at . Northern Areas Transport Corporation (NATCO) offers bus and jeep transport service to the two hubs and several