The India-Asia collision and the resultant Himalayas provide an outstanding example of continental collision. Associated with the development of this orogen, and formed as a consequence of subduction preceding collision, is the fascinating Kohistan terrane, belonging to Pakistani Himalayas. There are three main phases in the evolution of the Kohistan terrane-the mid Cretaceous intra-oceanic phase, Andean-type convergent margin phase, which lasted for 30 to 50 million years during the Late Cretaceous-Paleocene and the post-collisional phase. Since the mountain building processes have been operative and are still ongoing in this region, this area is one of Nature's most spectacular outdoor laboratories to study collision-related processes. Due to its remote and rugged accessibility, our knowledge about this region is still at infancy. We are using remote sensing, geochemistry, isotopic and geophysical data to test the hypothesis of collision-induced mantle displacement in Pakistani Himalayas.