The thread about state capitals gives rise to this question.
During the American Civil War, the capital of the Confederate States of America was located in Richmond, VA. The capital of the United States was located in Washington, DC. The distance between the two is only about 100 miles. Unfortunately, Fredericksburg, VA (my home town) was about equal distance between the two and so got the living hell kicked out of it, but that’s another story.
Now to the question: What two existing international captials are closest to each other?
Rome is the capital city of Italy. Within Rome is to sovereign Vatican City (of which Vatican City is the capital). I do not think it gets much closer than that.
I think after the Vatican and Rome, the next closest are Brazzaville and Kinshasa (capitals of Congo and Zaire, respectively), on opposite banks of the Congo River.
… Which is exactly why we want to look at DC - Ottawa if were looking for DC to be the “most isolated” – we’re not looking for the two capitals most distant from one another, we’re looking for the one capital farthest away from any other capital.
Moscow is about 700 km from Minsk (capital of Belarus).
Canberra is about 2,300 km from Wellington.
Brasilia is about 1,400 km from Asuncion (capital of Paraguay).
Ottawa is about 700 km from Washington DC.
I think Canberra and Wellington might be the joint winners here.
(And one odd thing about Canberra is that it’s a national capital with regular air services, but no international connections – that may be unique).
Canberra may be out – what’s its distance from Port Moresby, PNG? I make it 1800 statute miles, almost on the nose, but using a rather poor map projection and scale of miles for accuracy.
It says here that Auckland is 1099 nautical miles from Tongatapu, which works out to 1,265 statute miles if my calculation is accurate.
Vienna and Bratislava look to be about 58 miles apart, city center to city center. Prior to German reunification, a contender pair would have been Luxembourg City and Bonn, about 95 miles apart.
Bratislava plays this up, big time. They call themselves a “twin city” to Vienna, and advertise their lower cost of living and production, and their proximity and good transportation connections with Vienna, to try to attract business.