Baltoro Glacier:

This, the most famous trek in the Karakorum and widely regarded as one of the finest mountain treks in the world, follows the Baltoro glacier to Concordia and K2 base camp. Concordia is the name for the confluence of the Baltoro Glacier and the Godwin-Austen Glacier, in the heart of the Karakoram range of Pakistan. It is located in Baltistan region of Pakistan. The name was applied by European explorers, and comes from this location's similarity to a glacial confluence, also named Concordia, in the Bernese Oberland, part of the Central Alps. Around Concordia are clustered some of the highest peaks in the world. Four of the world's fourteen "eight-thousanders" are in this region, as well as a number of important lower peaks. Concordia offers the region's best place to camp for mountain enthusiasts not involved in climbing. With breathtaking views, it also offers short hikes to several important base camps: K2 (three hours), Broad Peak (two hours) and the Gasherbrums (three hours). An alternative exit to returning down the Baltoro Glacier is available by climbing the Gondogoro Pass (5450 meters).