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- Hungary 9
- Romania 5
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- Slovakia 3
- Soviet Union 3
- Ukraine 3
- Austria 2
- Bulgaria 2
- Serbia and Montenegro 2
- Yugoslavia 2
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Region
- Hungary 10
- Slovak Republic 8
- Ukraine 6
- Romania 5
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- Serbia 4
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Water Basin
- Danube River >> Romania 10
- Danube 10
License
- Creative Commons: Public Domain Mark 1.0 10