The deepest waters of the Black Sea extend to depths of well over two kilometers.
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- The Tisza is the largest tributary of the Danube.
- Water purification through nutrient retention of Danube floodplains is worth an estimated €369 million per year.
- Species loss in freshwater ecosystems is faster than anywhere else on Earth. There is a more than 50% decline in freshwater species populations over the past 30 years.