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Creator
- Yugoslavia 19
- Romania 11
- Bulgaria 3
- Soviet Union 3
- Austria 2
- Hungary 2
- Italy 2
- Albania 1
- Bosnia and Herzegovina 1
- Croatia 1
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Region
- Serbia 16
- Slovenia 15
- Macedonia 14
- Republic of Croatia 14
- Bosnia and Herzegovina 13
- Montenegro 12
- Romania 10
- Bulgaria 3
- Austria 2
- Hungary 2
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Water Basin
- Danube River >> Romania 16
- Danube 16
- Fiume Isonzo 2
- Isonzo 2
- Lake Prespa 1
- Lake Prespa 1
- Struma River 1
- Struma 1
- Vardar River 1
- Vardar 1
Institution
- Oregon State University 19