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Length of the China-Russia border (4,210 km) is 100 x Length of a Marathon race (42.2 km)
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Forest in El Salvador (2011) (2,860 km^2)
If this was a standard unit ...
Yes, there's now a book based on these numbers. Oxford University Press: July 2018.
Click here to learn more about it.
Click here for Podcast: Andrew Elliott interviewed for New Books Network.