ASEAN and the Mekong Delta: Running Aground on the Regional Agenda

At the ASEAN Future Forum 2026, the Mekong subregion officially returned to the policy agenda after years of being overshadowed by higher-profile issues like US–China competition, South China Sea disputes, and the wave of digital transformation. [1] 

The name “Mekong” once again dominated presentation screens and discussions concerning cross-border cooperation, sustainable development, and the role of the subregion within ASEAN’s future architecture. 

While this is not the first time the river has been a topic at international forums, this return may be different because it raises a major question. After more than two decades of discussions, joint declarations, and cooperative initiatives, has anything truly changed for the river and the communities that depend on it? 

Viewed from the Mekong Delta, where the consequences of every change across the basin ultimately converge, the gap between the declarations of Mekong diplomacy and the realities of daily life continues to widen rather than narrow. 

Many Mechanisms, Few Constraints

Despite receiving limited global attention, the Mekong Basin has more cooperative frameworks than any other river basin in the world. In addition to the Mekong River Commission (MRC), established in 1995 and the region’s longest-standing institution, there are the Lancang-Mekong Cooperation (LMC) mechanism, initiated by China in 2016; the Greater Mekong Subregion (GMS) program, sponsored by the Asian Development Bank; and a series of bilateral initiatives from the United States, Japan, South Korea, and Australia. [2]

However, the sheer volume of forums does not inherently translate to positive outcomes for local communities. The lingering question remains: “What has actually changed for the river?” 

In theory, an abundance of cooperative institutions theoretically highlights the strategic importance of the river; in practice, it largely reflects the geopolitical calculations of external powers rather than a genuine ability to solve problems. This creates a structural contradiction at the core of these diplomatic efforts.

The fundamental flaw is that these institutions rely almost entirely on consensus and political goodwill to create spaces for dialogue. Nevertheless, while member states may consult one another, share data, and issue recommendations, there is almost no sufficiently strong legal mechanism to enforce obligations or prevent unilateral decisions with cross-border consequences. [3]

As a result, while officials debate hydrological data sharing at conferences, upstream hydropower projects continue to be constructed and activated. Joint statements may consistently emphasize “sustainable development” and water governance, but the view from the Mekong Delta—the region that bears the ultimate cost of every change in the basin—offers little reason for optimism. Sediment flows reaching the delta have continued to decline. [4]

Mekong regional cooperation is unlikely to advance when national interests begin to clash.

Việt Nam at the Downstream End

Hà Nội has spent years as one of the most active voices in Mekong forums, consistently demanding data transparency, transboundary environmental impact assessments, and adherence to international water governance principles. However, diplomatic efforts have their limits. 

While Việt Nam is the nation most severely affected by upstream changes, it possesses the least capacity to influence those decisions. This vulnerability is apparent in the Mekong Delta, which is home to approximately 18 million people and plays a critical role in rice production, fisheries, and agricultural exports. [5]

The Mekong River Commission, the sole legal framework connecting Việt Nam and other lower-basin countries, holds no binding authority over China, a nation that controls the river’s upper reaches with at least 11 large hydropower dams operating on the mainstream. [6]

Concurrently, Laos has staked its economic future on becoming the “battery of Southeast Asia,” steadily pursuing downstream dam projects despite formal objections from Việt Nam within the MRC framework. [7] 

There is simply no legal instrument powerful enough to compel upstream nations to alter dam operations or abandon energy projects they deem essential for their own economic development. 

Diplomacy can only persuade, and its reach has obvious limits. This reality explains why Việt Nam has gradually pivoted from attempting to control the river’s flow to adapting to its permanent changes. 

A turning point was Resolution 120/NQ-CP, issued in 2017 regarding the sustainable development of the Mekong Delta. Moving away from a futile struggle against nature via extensive dike systems and massive water-control infrastructure, the government no longer relies entirely on blocking water. 

Instead, policy now emphasizes “living in harmony with nature,” choosing to adapt to shifting conditions rather than resist them, while accepting that many ecological transformations can no longer be reversed. [8]

Nevertheless, adaptation is not a true solution; it is merely the management of consequences. The root causes of the crisis remain upstream and must be addressed there.

Adaptation, however, is not a solution. It is merely the management of consequences. The root causes lie upstream and must be addressed there.

The Delta is Slowly Sinking

As debates over river governance continue to drag at international conferences, the Mekong Delta is currently battling a severe dual ecological crisis: hydrological pressure from upstream and environmental assaults from the sea.

The immediate threat is saltwater intrusion. During the 2025–2026 dry season, salinity arrived earlier, penetrated farther inland, and persisted for much longer. Forecasts from the National Center for Hydro-Meteorological Forecasting indicate that the 4‰ salinity boundary at major river mouths may extend 40 to 70 kilometers inland, directly affecting freshwater supplies for production and daily life for millions of people. [9]

Compounding this situation is the crisis of land subsidence. According to the Southern Institute of Water Resources Research, approximately 286 of the Mekong Delta’s 744 kilometers of coastline are experiencing severe erosion. [10] 

For decades, excessive groundwater extraction has caused widespread land subsidence, partly due to the chronic shortage of surface water from upstream. This increases flood risks and allows saltwater intrusion to extend even farther inland during dry seasons. [11]

Over the long term, projections indicate that the salinity boundary on the Tiền River could reach approximately 55.5 kilometers inland by 2030 and as far as 62.5 kilometers by 2050. [12] This is no longer a hypothetical worst-case scenario; it is a trend that has been rigorously measured and scientifically projected.

Over the long term, projections indicate that the salinity boundary on the Tiền River could reach approximately 55.5 kilometers inland by 2030 and as far as 62.5 kilometers by 2050. [12] This is no longer a worst-case scenario. It is a trend that has been measured and scientifically projected.

Discussions Without the Victims

Debates regarding the Mekong are often framed in the diplomatic language of public policy, emphasizing terms like water security, sustainable development, green transition, and regional cooperation. While these concepts hold legitimate value, they abstract the very real and concrete losses occurring to specific individuals on the ground.

These abstract concepts represent farming households losing their freshwater supplies for cultivation. They represent riverside communities facing unpredictable land loss due to severe erosion. They represent families forced to abandon multi-generational fishing livelihoods as fish stocks plummet, driving them to seek employment in industrial zones or distant urban centers instead. [13]

Field observations in the Mekong Delta over many years reveal a harsh reality: residents are constantly adapting to environmental changes they neither created nor can control. It is the locals who must replant mangrove forests to preserve their land, alter agricultural models to survive saline conditions, and find entirely new livelihoods when traditional ways of life fail.

Most notably, the people who bear the most direct consequences of the Mekong’s future—resulting from decisions on hydropower, sand mining, and flow regulation—remain largely absent from regional decision-making structures. These discussions occur primarily among governments, international organizations, and donors.

Downstream communities only have their voices heard indirectly through research reports, consultations, or development projects. Although the MRC operates the Mekong Forum and maintains public consultation mechanisms, local communities have extremely limited access to these processes, particularly in Việt Nam, where independent civil society space continues to face substantial legal and practical constraints. [14]

From Water Governance to Environmental Justice

As the Mekong returns to the regional agenda following the ASEAN Future Forum 2026, a question must be asked: Do current cooperation mechanisms genuinely protect the communities that depend on the river? 

For decades, Mekong diplomacy has revolved around geopolitics, national interests, economic development, and regional stability. However, it has become increasingly clear that the issue is fundamentally a matter of environmental justice.

From this perspective, the situation demands evaluation through highly concrete questions. Can people keep their land? Can they maintain their livelihoods? 

Furthermore, will transboundary environmental damage finally be recognized as an issue of responsibility and fairness, rather than dismissed as an “unintended consequence” of development?

This inevitably leads to a deeper question of power regarding who actually holds the right to decide the future of the river. At present, the answer tilts heavily toward the countries, organizations, and interest groups with sufficient resources to occupy conference rooms, entirely bypassing the people who face the imminent loss of their land, water, and livelihoods.

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Thiên Di wrote this article in Vietnamese and published it in Luật Khoa Magazine on June 24, 2026. Đàm Vĩnh Hằng translated it into English for The Vietnamese Magazine.