The Indus Waters Treaty in Abeyance: Law Cannot Move Mountains

When India declared the Indus Waters Treaty (IWT) to be “in abeyance” following the April 2025 Pahalgam attack in Indian-administered Kashmir, the announcement was widely portrayed as a watershed in South Asian geopolitics. For the first time in more than six decades, one of the world’s most durable transboundary water agreements appeared to have been unilaterally set aside. Predictions quickly followed. Some warned that Pakistan’s water lifeline had been severed. Others argued that India had finally acquired the ability to use water as a strategic weapon.

Both conclusions run ahead of reality.

The declaration has unquestionably altered the political relationship between the two countries and weakened the institutional framework through which the Treaty has long functioned. But it has not transformed the physical realities of the Indus basin. The current debate often conflates three very different forms of power: legal power, operational power and physical capability. India’s declaration has affected them in very different ways.

The legal position is less ambiguous than the political rhetoric suggests. The Treaty, signed in Karachi in 1960, contains no provision permitting either party unilaterally to suspend or terminate its operation. Article XII provides that it shall remain in force until terminated by another duly ratified treaty concluded for that purpose. General treaty law does not recognise “abeyance” as an independent legal status that one party may simply declare. International law acknowledges doctrines such as termination, suspension and material breach under specific conditions, but India has not formally invoked any of them. Instead, New Delhi has announced that it will no longer operate within the Treaty’s procedural framework while stopping short of claiming formal withdrawal.

Subsequent legal developments have reflected this divergence. Between 2023 and 2026, the Permanent Court of Arbitration issued a succession of awards affirming its own jurisdiction, even though India refused to participate. New Delhi rejected each decision, arguing the tribunal had been unlawfully constituted. At the same time, India continued, until the declaration of abeyance, to engage with the parallel Neutral Expert process concerning the Kishenganga and Ratle projects, the dispute resolution mechanism India accepts under the Treaty. The World Bank, which facilitated the Treaty’s negotiation and retains limited procedural responsibilities, has likewise declined to endorse the notion that the Treaty can simply be suspended by one party, while emphasising that its own role is administrative rather than enforcement-oriented.

Legally, therefore, the Treaty continues to exist. Politically, one party has chosen to disengage from significant parts of its institutional machinery. Those are not the same thing.

Yet even this legal dispute risks obscuring a more fundamental reality. Rivers ultimately obey geography rather than political declarations.

The Indus basin is often discussed as though it were a single hydraulic system. In practice it comprises two very different landscapes. The Ravi, Beas and Sutlej descend rapidly onto the plains of north-western India, where relatively gentle terrain allows large reservoirs, canal networks and inter-basin transfers. It was on these rivers that India constructed projects such as Bhakra, Pong and Ranjit Sagar, transforming agriculture across much of northern India.

The Indus, Jhelum and Chenab present a very different engineering environment. They descend through narrow Himalayan valleys, unstable geology and highly seismic terrain before entering Pakistan’s plains. These rivers possess enormous hydropower potential, but they are far less suitable for large-scale storage or long-distance diversion. Their physical characteristics impose constraints that no political declaration can remove.

This distinction explains why the Treaty assumed the shape that it did. Politics determined the bargaining. Geography determined the settlement.

India received the rivers that could most readily support extensive irrigation development within its territory. Pakistan retained the rivers upon which its irrigation economy depended and which, because of their geography, were inherently more difficult to divert elsewhere. The allocation was not simply a diplomatic compromise. It reflected the geographic and engineering realities of the basin.

The Treaty’s critics often portray it as an extraordinary concession by one side or the other. A better understanding is that it represented an unusually pragmatic recognition of physical constraints. Rather than attempting to overcome geography, the negotiators largely accommodated it.

That reality continues to matter today.

One of the most persistent misconceptions surrounding India’s declaration is that legal freedom automatically translates into hydraulic capability. It does not.

The Treaty already granted India substantial, though carefully defined, rights over the Western Rivers. It permits run-of-river hydropower development under the detailed design conditions of Annexure D, limited agricultural use and specified categories of storage. Yet after more than six decades, India has only partially utilised these entitlements. The principal constraint has not been the Treaty itself. It has been the extraordinary difficulty of constructing major infrastructure in the upper Indus basin.

Mountain engineering is unforgiving. Narrow valleys restrict reservoir sites. Fragile geology complicates construction. Extreme sediment loads reduce reservoir life. High seismic risk raises costs and design standards. Even where projects are legally permissible and politically desirable, engineering has the final word.

This distinction between legal authority and physical capability is frequently overlooked in public debate. The declaration of abeyance has not created new reservoirs, built diversion canals across the Himalaya, altered river gradients, reduced construction costs or eliminated geological constraints. Those limitations remain precisely as they were before the political announcement.

Nor does India’s long-discussed National River Linking Project fundamentally alter this assessment. The scheme, as presently conceived, does not incorporate the Indus basin. Proposals for future inter-basin transfers from the Western Rivers continue to surface in strategic discussions, but they remain conceptually attractive precisely because they are technically difficult. Their feasibility depends less on legal permission than on engineering, economics and time.

None of this should be mistaken for complacency. India’s declaration has undoubtedly expanded its political room for manoeuvre. It has weakened institutional restraints and may accelerate projects that previously moved more slowly through the Treaty’s consultative mechanisms. Those changes carry strategic consequences that deserve careful attention.

But they should not be confused with an immediate transformation of the basin’s hydraulic balance.

Much of the current public debate proceeds from the assumption that once legal constraints disappear, physical constraints disappear as well. That assumption misunderstands how river basins work. International treaties regulate human behaviour. They do not rewrite geography.

The Indus Waters Treaty has entered an uncertain phase. Its legal machinery is under unprecedented strain, and its future will depend as much on political choices as on judicial decisions. Yet the basin itself remains governed by the same mountains, rivers and engineering realities that shaped the agreement in 1960.

Political declarations may weaken institutions. They may even suspend cooperation. They cannot move mountains.

But they can do something quieter, and potentially more damaging. That is the subject of the second part of this series.