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- Jonglei Canal (South Sudan) 6
- Politics and government 5
- Agriculture 4
- International regimes 4
- Irrigation 4
- Water-power 3
- Bureaucracy 2
- Finance 2
- Foreign relations 2
- Merowe Dam (Sudan) 2
- Water-supply 2
- Building 1
- Desertification 1
- Evaporation 1
- Floods 1
- Food supply 1
- Groundwater 1
- Hydrology 1
- Precipitation (Meteorology) 1
- Riparian areas 1