The Indus Water Treaty (IWT) is the most significant confidence-building measure between India and Pakistan. Despite the wars and hostilities, the IWT has functioned well since it was signed in 1960. However, one cannot ignore the challenges of future supplies of fresh water between the two countries. The article delves into a historical account of how the treaty came about, the salient features of the treaty and examines whether ‘water rationality’ will continue to govern the riparian relationship or whether ‘water sharing’ will open up a new front of contentious politics.

China is a thirsty country desperately in need of water—a lot of it. In order to meet its water and energy requirements in the densely populated and fertile northern plains, it is successively making interventions in the Tibetan rivers in the southern part through dams and diversions. While China is well within its riparian rights to do so, a set of externalities involving the principles of water-sharing and lower riparian needs—stretching from Afghanistan to Vietnam—raise concerns.