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Parks
4
Rapids
4
Recreation areas
4
Rivers
4
Salt mines and mining
4
Towers
4
Vegetation boundaries
4
Water
4
Waterfalls
4
Aqueducts
3
Bridges
3
Electric power transmission
3
Marine accidents
3
Navigation
3
Reefs
3
Runways (Aeronautics)
3
Buildings
2
Chimneys
2
Communication
2
Contours (Cartography)
2