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- Rivers 18
- Dams 7
- Irrigation 7
- Politics and government 6
- Technology 5
- Water quality 5
- Watersheds 5
- Reservoirs 4
- Wadis 4
- Agriculture 3
- Canals 3
- Economics 3
- Finance 3
- Hydrology 3
- Lakes 3
- Bureaucracy 2
- Peace 2
- Riparian areas 2
- Water diversion 2
- Water-power 2
