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Boundaries
5
Wetlands
4
Environment
3
Quality
3
Quality control
3
Administrative and political divisions
2
Cities and towns
2
Coasts
2
Elevation
2
Glaciers
2
Hydrology
2
Ice
2
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2
Lakes
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Location
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Marshes
2
Mines and mineral resources
2
Reservoirs
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Salt mines and mining
2
Sand
2