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Salt mines and mining
2
Towers
2
Water
2
Waterfalls
2
Wetlands
2
Aqueducts
1
Bridges
1
Buildings
1
Cliffs
1
Communication
1
Contours (Cartography)
1
Demography
1
Electric lines
1
Electric power transmission
1
Fault zones
1
Fuelbreaks
1
Geysers
1
Glaciers
1
Hot springs
1
Human settlements
1