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Subject
Boundaries
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26
Countries
9
Boundary disputes
7
Islands
4
Provinces
4
States
4
Equator
3
International Date Line
3
Polar regions
3
Tropics
3
Administrative and political divisions
2
Ice shelves
2
Inland Waters
2
Maritime boundaries
2
Beaches
1
Bodies of water
1
Coasts
1
Continents
1
Disputed boundaries
1
Grids (Cartography)
1