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What is the longest great circle distance between the capitals of two countries that share a land border? The most common first answer I have heard comes in fourth.

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  • $\begingroup$ The common (wrong) answer which comes to mind is Moscow and Beijing, right? ;) $\endgroup$ – Enamul Hassan Sep 24 '16 at 6:00
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    $\begingroup$ @manetsus: that is correct. $\endgroup$ – Ross Millikan Sep 24 '16 at 14:02
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The distance between

Paris (France) and Brasilia (Brasil) is 8730 km.

Yes, they do share a land border,

because French Guiana is a proper d├ępartement of France.

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  • $\begingroup$ This was the expected answer. $\endgroup$ – Ross Millikan Sep 24 '16 at 14:08
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Google tells me that the distance between

Moscow and Pyongyang is 6,408 km.

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  • $\begingroup$ Yes, that beats Moscow-Beijing but loses to Paris-Brasilia and Paris-Parmaribo, Surinam. Not many know that Russia borders North Korea. $\endgroup$ – Ross Millikan Sep 24 '16 at 21:08
  • $\begingroup$ This was a question on Jeopardy once, and their answer was Moscow-Pyongyang. $\endgroup$ – pacoverflow Dec 10 '17 at 0:53
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Could be 15,970 km or 9,920 mi or so, between...

...Oslo, Norway, and Canberra, Australia.

Their countries share a border...

...in Antarctica.

If touching at a single point counts, make that 17,660 km or 10,970 mi or so, between...

...Oslo, Norway, and Wellington, New Zealand.

Their countries touch...

...at the south pole.

If you care to dispute this, you're probably in the company of many earthlings, but not many in those countries.

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    $\begingroup$ Well done. I am in the company of the earthlings you mention, but am impressed nonetheless. $\endgroup$ – Ross Millikan Sep 24 '16 at 14:08
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    $\begingroup$ I care to dispute it! Queen Maud Land is not, strictly speaking, part of the country Norway. Rather, it's a dependent territory. Similarly, AAT is not part of Australia the country. $\endgroup$ – Mark Dickinson Sep 24 '16 at 15:13
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Moscow to Washington? You can drive over the Bering straight at certain times of year which could qualify Russia and USA as sharing a border. Does this count?

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    $\begingroup$ No, that is the point of specifying a land border. $\endgroup$ – Ross Millikan Sep 24 '16 at 21:06
  • $\begingroup$ I understood that, I am querying if the Bering strait counts as a land border. I'm not too sure of the geography of that area of the world but have heard anecdotes of people covering it by car $\endgroup$ – Darren H Sep 24 '16 at 21:23
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    $\begingroup$ As I see it, frozen water is not land, so even if you can cover it by car it is still a sea border. If there were an island shared by the US and Russia, it would count, but I am not aware of one. $\endgroup$ – Ross Millikan Sep 24 '16 at 21:26

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