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Subject
Inland Waters
205
Rivers
155
Hydrology
137
Boundaries
122
Watersheds
118
Groundwater
83
Transportation
66
Oceans
56
Land use
54
Agriculture
48
Farming
48
Urbanization
48
Location
44
Countries
40
Administrative and political divisions
33
Bodies of water
33
Drainage
33
Groundwater flow
31
Elevation
28
Geoscientific Information
27