Pakistan might be considered in South Asia but actually from climate point of view it is more Middle Eastern as it represents the eastern flank of the dry region which prevails over Middle East. Pakistan is drier then Turkey and probably more similiar to Syria. Only the northern Pakistan do we have sufficient rain/snow which of course aggregates as ice and glaciers feeding the Indus and other rivers which then flow south through the sandy plains. Most of the Pakistani agriculture is supported by irrigation feeding off the rivers and dams. Tarbela, Mangla are two large ones. In fact we have almost a repeat although on vastly bigger scale what we had during the Indus Civilization which also fed from the River Indus thus the name ~ IVC.
As a sidenote most India that has the 1.4 billion people is extremely damp with heavy rain and tropical jungles. This is not the case for Pakistan. Either we have high altitude alpine country in the north, high plateau on the west resembling Iran or deserts on the plains. The green strip along the Indus you see on satellite images is artificial irrigated land.
Click on this link and you will see the dramatic effect of artificial irrigation and desert adjacent to each other. The Indus irrigation system is one of the largest integrated systems in the world and almost supports all agriculture in Pakistan.
Link :
https://www.google.co.uk/maps/place...x46b7a1f7e614925c!8m2!3d30.375321!4d69.345116
Below is video of Tarbela Dam in north of Pakistan [not too far from my ancestral village in Pakistan] which acts as huge water storeage and hydro power. Pakistan needs more of these in north part of the country to store water and feed the dry south.