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- Agriculture 6
- Politics and government 6
- Population 4
- Hydrology 3
- Demography 2
- Housing 2
- Irrigation 2
- Resource allocation 2
- Technology 2
- Blue Nile River (Ethiopia and Sudan) 1
- Civil war 1
- Dams 1
- Economics 1
- Güneydoğu Anadolu Projesi (Turkey) 1
- International regimes 1
- Jonglei Canal (South Sudan) 1
- Land tenure 1
- Negotiation 1
- Reclamation of land 1
- Reservoirs 1
