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Water Basin
- Danube River >> Romania 48
- Danube 48
- Meuse >> Netherlands 38
- Rhine River >> Netherlands 38
- Rhine-Meuse 38
- Colorado River 30
- Colorado 30
- La Plata 28
- Río de la Plata 28
- Rio Grande (North America) 27
- Rio Grande >> Mexico >> North America 27
- Unknown 26
- Saint Lawrence River >> Franklin County >> New York >> United States 25
- St. Lawrence 25
- Nile River >> Egypt 23
- Nile 23
- Brahmaputra River >> Bangladesh 22
- Ganges River >> Bangladesh 22
- Ganges-Brahmaputra-Meghna 22
- General 22