576
France's longest border is with Brazil
(lemmy.world)
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Honestly I'm more surprised that the border with Belgium is longer than the border with Spain
I think it's just measuring the longest contiguous border.
The border with Spain has Andorra in the middle
There isn't a 2nd number on the east side of Andorra so I think the 623 is the total with Spain.
Could be or it's just counting the longest border they share