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The Joint Danube Survey 5 (JDS5), the world’s most comprehensive investigative surface-water monitoring effort, will officially kick off on 1 July 2025 in Vienna. This large-scale scientific survey will bring together experts from 14 countries to assess the health of the Danube River and its major tributaries.

Rivers are a natural resource that have been a focal point of transboundary governance for centuries. It is challenging to manage them for the benefit of riparian communities – especially if they are transboundary. This requires the development of a water infrastructure to harvest the socioeconomic benefits, while at the same time protecting the ecosystem for future generations.

River Basin Organizations (RBOs) have been established in many of the world’s basins to better coordinate different stakeholders’ actions and foster cooperation instead of conflict. Based on the experiences of several RBOs worldwide, several key characteristics for their effectiveness can be identified.

Sub-basins are smaller working units within a larger river basin or catchment area. They represent a distinct geographical area that is delineated based on the natural drainage patterns of rivers and their tributaries. Sub-basins are used to facilitate the management and assessment of water resources, allowing for more focused and localized analysis and planning within the broader context of the overall river basin.