This is far and away the most popular trek in Pakistan, attracting large numbers of trekking group as well as numerous mountaineering expeditions en route to peaks around Concordia every year.
The trek is along the Braldu and Biaho Rivers and then onto Baltoro Glacier is a long and extremely demanding one and takes almost 08 days to reach.
The reward, on the other hand, is spectacular, taking you right into to the heart of Karakorum gigantic mountains at Concordia, where the Godwin-Austin Glacier descends from K2 to join the Baltoro. Surrounding these huge expanses of ice are some of the highest peaks in the world, with 7 of them (K2, Broad peak, Chain of Gasherbrum, Mustagh Tower, Golden Throne, Chogolisa and Masherbrum clearly visible.