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Circumference of Mercury (15,330 km) is 5 x Length of the Rio Grande (USA, Mexico) (3,057 km)
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Forest in Albania (2014) (8,100 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.