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Circumference of Earth's Moon (10,920 km) is 2 x Length of Yellow River (Huang He) in China (5,460 km)
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Forest in Spain (2011) (186,000 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.