Regarding Afro-Eurasia as single continent, I tried to draw longest geodesic line within it and got

enter image description here

enter image description here

which is 16628 km (10 332 miles) length.

Looks like this line is rather stable and lasts from Navarin cape in Russia to Quoin point in SAR.

Is this known feature is this really longest and what is it's name?

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    $\begingroup$ Since your path crosses a sea, are you just looking for the two points in Europe/Africa/Asia that are furthest apart? Or are seas considered "land" in your definition? $\endgroup$
    – user967
    Jul 3, 2018 at 16:30
  • $\begingroup$ (also crosses into Arctic Ocean it looks like?) $\endgroup$ Jul 3, 2018 at 17:01
  • $\begingroup$ Note that I believe the inspiration for this post may be a similar posting around the Internet about North America here $\endgroup$ Jul 3, 2018 at 17:08
  • $\begingroup$ @BarryCarter the only assumption I made it that Suez Canal doesn't split Afro-Eurasia, other things comply definition of "diameter" of random shape: en.wikipedia.org/wiki/Diameter#Generalizations $\endgroup$
    – Dims
    Jul 3, 2018 at 19:13
  • $\begingroup$ @JeopardyTempest Arctic ocean is Ok, I am just finding two farest points of Afro-Eurasia. $\endgroup$
    – Dims
    Jul 3, 2018 at 19:15


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