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Subject
Boundaries
7
Water
5
Nature
4
Population
3
Rivers
3
Transportation
3
Cartography
2
Cities and towns
2
Grids (Cartography)
2
Habitat (Ecology)
2
Lakes
2
Location
2
Seas
2
Species diversity
2
Air travel
1
Airports
1
Continents
1
Contours (Cartography)
1
Drainage
1
Ecological districts
1