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Rapids
2
Rivers
2
Runways (Aeronautics)
2
Salt mines and mining
2
Towers
2
Vegetation boundaries
2
Water
2
Waterfalls
2
Aqueducts
1
Buildings
1
Chimneys
1
Communication
1
Contours (Cartography)
1
Cooling towers
1
Demography
1
Electric lines
1
Electric power transmission
1
Embankments
1
Fills (Earthwork)
1
Fuelbreaks
1