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Re:Rwanda just released the first smartphone made entirely i... by smeyer on Thursday October 10, 2019 @09:45AM (#21214355)
Or he just looped around the coastline once at a tighter resolution than your source of 30,500 km

https://en.wikipedia.org/wiki/Coastline_paradox

(Also thanks for the AMA link)

Re:Rwanda just released the first smartphone made entirely i... by samatman on Thursday October 10, 2019 @12:09PM (#21216162)
The coastline paradox is cute, but any route using coastal roads will be shorter than any reasonable coastline estimate, for obvious reasons.
Re:Rwanda just released the first smartphone made entirely i... by penagwin on Thursday October 10, 2019 @06:34PM (#21219869)
Plus the "resolution" of the coast is limited by the size of humans.

The coastline paradox is much more of a measurement problem then a physical one.