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- Desertification 6
- Agriculture 4
- Watersheds 3
- Demography 2
- Precipitation (Meteorology) 2
- Soils 2
- Aquifers 1
- Arid regions 1
- Climate 1
- Dry farming 1
- Economics 1
- Erosion 1
- Evaporation 1
- Finance 1
- Groundwater 1
- Hydrogeology 1
- Irrigation 1
- Jonglei Canal (South Sudan) 1
- Population 1
- Rain and rainfall 1
