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Sewage disposal plants
12
Water treatment plants
12
Harbors
9
Hydrographic structures
9
Ice
9
Ice sheets
9
Oil well drilling rigs
9
Piers
9
Snow
9
Tundra ecology
9
Tundras
9
Wharves
9
Names (Geographical)
7
Tunnels
7
Floods
6
Aerial tramways
5
Breakwaters
5
Power generation sites
5
Power plants
5
Ski lifts
5