The Greater Mekong Region, spanning nearly 2 million square kilometers across Myanmar, Thailand, Laos, Cambodia, and Vietnam, is at a crossroads. Rapid industrialization and urbanization are straining water resources, and groundwater—once a reliable fallback—is now under unprecedented pressure. A new review published in the *Journal of Hydrology: Regional Studies* (known in Vietnamese as *Tạp chí Thủy văn học: Các nghiên cứu khu vực*) offers the first comprehensive look at the region’s hidden water reserves, revealing both opportunities and urgent risks that could shape everything from energy projects to agricultural expansion.
Lead author Marc Viossanges, affiliated with the National Centre for Groundwater Research and Training (NCGRT) in Australia and the International Water Management Institute (IWMI) in Laos, spent years synthesizing 179 scientific documents to map the region’s aquifers and groundwater threats. The result? A set of regional hydrogeological maps that highlight arsenic contamination, saltwater intrusion, and over-extraction—issues that don’t respect national borders but are often managed in isolation.
“Groundwater doesn’t care about political boundaries,” says Viossanges. “Yet, our management of it often does. This fragmentation is leaving critical gaps—especially as countries rush to develop energy and irrigation projects that rely on unseen water reserves.”
The findings suggest that while transboundary aquifers exist, many of the region’s groundwater challenges are strikingly similar across borders. A limestone aquifer in northern Thailand, for instance, shares hydrological traits with formations in Laos and Vietnam, yet each country approaches extraction and contamination risks differently. The study argues that coordinated regional strategies—not just national policies—could prevent costly mistakes.
For the energy sector, this has direct implications. Hydropower dams, geothermal exploration, and even cooling systems for industrial plants depend on reliable water access. Overlooking groundwater vulnerabilities could lead to project delays, environmental liabilities, or even shutdowns if aquifers become depleted or contaminated. Viossanges points out that “without a unified framework, investors may unknowingly back projects that risk water shortages in just a few years.”
The research also underscores a paradox: while groundwater remains a lifeline for millions, its long-term sustainability is rarely assessed at a regional scale. The maps now provide a foundation for policymakers, developers, and scientists to collaborate—before the next drought or industrial boom forces urgent, reactive decisions.
As Southeast Asia’s economies grow, the choices made today about groundwater will ripple across industries. This study doesn’t just fill a knowledge gap—it offers a roadmap for smarter, more resilient development. And in a region where water is power, that could be the most valuable resource of all.