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Water Basin
- Danube River >> Romania 7
- Danube 7
- Mesta 3
- Mutlu Dere >> Bulgaria 3
- Nestos 3
- Rezvaya 3
- Golema Dere >> Bulgaria 2
- Maritsa River 2
- Maritsa 2
- Struma River 2
- Struma 2
- Velaka 2
- Coruh 1
- Dnieper >> Ukraine 1
- Dnieper 1
- Dniester >> Ukraine 1
- Dniester 1
- Don >> Russia 1
- Don 1
- Elancik 1
