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Subject
- Inland Waters[remove]739
- Rivers189
- Watersheds139
- Hydrology132
- Hydrography105
- Bodies of water97
- Lakes86
- Groundwater76
- Environment60
- Boundaries52
- Geoscientific Information35
- Oceans32
- Groundwater flow31
- Coasts25
- Seas25
- Ocean21
- Seashore21
- Biology and Ecology16
- Landslides14
- Shorelines14