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Subject
- Inland Waters11
- Location9
- Boundaries8
- Waterways5
- Hydrography4
- Rivers4
- Watersheds4
- Geoscientific Information3
- Hydrogeology3
- Administrative and political divisions2
- Contours (Cartography)2
- Groundwater2
- Groundwater recharge2
- Hydrology2
- Remote sensing2
- Runoff2
- Special districts2
- Utilities and Communication2
- Water districts2
- Aquifers1