The Indus Waters Treaty between the two countries was signed in 1960 and facilitated by the World Bank. India controls the Beas, Ravi and Sutlej rivers, while Pakistan oversees the Indus, Chenab and Jhelum rivers under the treaty.

India also allows waters from the three rivers under its control to flow from its territory to Pakistan, subject to conditions such as the building of hydroelectric projects.

Having withstood four India-Pakistan wars, the treaty is facing a new challenge, with New Delhi wanting a reassessment of its terms and Islamabad objecting to certain Indian hydroelectric projects.

Analysts say Delhi believes Islamabad was given a significantly larger share of the river waters without factoring in India’s large population. Delhi’s position has also hardened over a recent surge in violence in Indian-administered Kashmir, which it has blamed on Pakistan-based militants.

Last month, India sent a formal notice to Pakistan calling for a review of the treaty, following up on a similar demand it issued to Islamabad last year.