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- Watersheds 51
- Groundwater 21
- Agriculture 19
- Irrigation 18
- Aquifers 14
- Hydrology 11
- Soils 11
- Aswan High Dam (Egypt) 8
- Climate 8
- Dams 7
- Demography 7
- Water quality 7
- Precipitation (Meteorology) 6
- Hydrogeology 5
- Technology 5
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- Deserts 3
- Ecology 3
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