1. Rhone River and Arve River, Geneva, Swiss
2. Ilz River, Inn River and Danube River, Passau, Germany
2. Ilz River, Inn River and Danube River, Passau, Germany
3. Ohio River and Missisippi, Illinois, U.S.A
4. Gia Lăng River and Dương Tử River , Trùng Khánh, China.
5. Rio Negro River and Rio Solimoes River , Manaus, Brazil
6. Green River and Colorado River , Utah, U.S.A
7. Thompson River and Fraser River , Lytton, Canada
8. Alaknanda River and Bhaghirathi River , Devprayag, India.
9. Mosel River and Rhine River , Koblenz, Germany.
10. Drava River and Danuve River , Osijek, Croatia
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