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- Rivers
- Environmental aspects 12
- History 12
- Description and travel 8
- Regulation 8
- Stream ecology 8
- Dams 4
- Environmental conditions 4
- Hydrology 4
- Lakes 4
- Mountains 4
- Nile in literature 4
- Stream conservation 4
- Stream restoration 4
- Streamflow 4
- Travel 4
- Water 4
- White-water canoeing 4
- 20th century history: c 1900 to c 2000 2
- Approvisionnement 2
- Bodies of water 2
- Canals 2
- Drainage 2
- Eau 2
- Economic aspects 2
- Effect of environment on 2
- Effect of human beings on 2
- Environmental Science 2
- Environmental protection 2
- Environmental science, engineering and technology 2
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