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Subject
Inland Waters
201
Rivers
155
Hydrology
137
Boundaries
119
Watersheds
118
Groundwater
79
Transportation
62
Land use
53
Oceans
50
Agriculture
48
Farming
48
Urbanization
48
Location
44
Countries
40
Bodies of water
33
Drainage
33
Groundwater flow
31
Administrative and political divisions
30
Structure
25
Geoscientific Information
22