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- Inland Waters[remove]1,498
- Rivers439
- Watersheds208
- Hydrology202
- Groundwater155
- Geoscientific Information145
- Environment131
- Bodies of water117
- Hydrography115
- Lakes98
- Hydrogeology83
- Basins (Geology)73
- Elevation70
- Structure61
- Drainage56
- Boundaries54
- Dams44
- Location38
- Transportation38
- Oceans35