Governance & Policy
Transboundary Water
Definition
Transboundary waters are surface and groundwater bodies that mark, cross or lie on boundaries between states: nearly half of the world's river flow and hundreds of aquifer systems, shared by 153 countries and home to over 40% of the world's population. Governance rests on the UN Watercourses Convention (1997, in force 2014) and the UNECE Water Convention, both built on equitable and reasonable use and the no-harm rule, alongside over 400 basin treaties — though many shared basins still lack cooperative arrangements (SDG 6.5.2 tracks this).
References
This reference provides supporting context for how “Transboundary Water” is defined and used.
Source imported for editorial provenance.
Overview
How it is used
The concept structures basin commissions (Mekong, Nile, Rhine), UN convention processes, hydropolitics analysis and SDG 6. 5 monitoring.
Why it matters
As water scarcity grows, transboundary governance is where climate adaptation and conflict prevention become the same work.