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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.

The Sava River is the largest tributary in discharge and the second largest in catchment area. The International Sava River Basin Commission was established in 2005 to implement the Framework Agreement on the Sava River Basin (FAS RB.) The commission’s main goal is coordinating transboundary cooperation in the Sava River Basin.

The Danube River flows into the Black Sea at the Danube Delta, making the Black Sea the receiving sea for the Danube's water. A receiving sea refers to the body of water into which a river or other watercourse empties its flow. In this context, the Black Sea serves as the final destination for the waters of the Danube River.