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Water Basin
- Danube River >> Romania 48
- Danube 48
- Meuse >> Netherlands 39
- Rhine River >> Netherlands 39
- Rhine-Meuse 39
- Colorado River 30
- Colorado 30
- La Plata 29
- Río de la Plata 29
- Unknown 28
- Rio Grande (North America) 27
- Rio Grande >> Mexico >> North America 27
- Saint Lawrence River >> Franklin County >> New York >> United States 25
- St. Lawrence 25
- Brahmaputra River >> Bangladesh 24
- Ganges River >> Bangladesh 24
- Ganges-Brahmaputra-Meghna 24
- Meghna River >> Bangladesh 24
- General 23
- Nile River >> Egypt 23