The Himalayas are the world’s premier Folded mountain system, representing the result of a continent-to-continent collision. Geographically, they are characterized by large-scale folds, thrust faults and high sedimentary content. When the Indian landmass moved northward and struck Eurasia, the horizontal pressure “squeezed” the crust, causing it to rise. Because this process is still active, the Himalayas continue to grow in height. Their geographical significance lies not only in their elevation but also in their role as a climatic barrier and the source of major perennial rivers like the Ganges, Indus and Brahmaputra.