AHC: Circular Country

This is a weird challenge that I thought of. If it doesn't belong here than please lock/delete/move it. Basically, the challenge is to create a country with borders that are as close to a perfect circle as possible. I put this in Before 1900 but a POD after 1900 can also be used.
 
Andorra, perhaps? It only has a few odd edges here and there to trim off. However; what would be the MO for a nation to do that (and for neighbors to abide by it)? All I could think of would be the result of a treaty.
 
A circle moght actually be a reasonable shape for a city-state enclave within a larger nation. I'm thinking of a city which starts out in the medieval era as gaining a degree of independence through exemption from taxation by the lord of the surroudning countryside. This exemption applies to "all land within thw city walls" and a precedent is set up that if the city buys up surrounding land and extends its walls the tax emeption is also extended. Eventually the city and surrounding feudal domain become separated nations, but the idea that the city can expand indefinitely through buying up land threatens the surrounding nation, especially as the industrial revolution brings greater urbanization. Eventually, the two neighbours agree upon a limit to urban expansion and this limit is set as a circle a certain radius from the centre of the city.
 

PhilippeO

Banned
isn't most island nations in Pacific has border like this ? border in sea EEZ is 200 miles, so in big map, result is circular.
 
A circle moght actually be a reasonable shape for a city-state enclave within a larger nation. I'm thinking of a city which starts out in the medieval era as gaining a degree of independence through exemption from taxation by the lord of the surroudning countryside. This exemption applies to "all land within thw city walls" and a precedent is set up that if the city buys up surrounding land and extends its walls the tax emeption is also extended. Eventually the city and surrounding feudal domain become separated nations, but the idea that the city can expand indefinitely through buying up land threatens the surrounding nation, especially as the industrial revolution brings greater urbanization. Eventually, the two neighbours agree upon a limit to urban expansion and this limit is set as a circle a certain radius from the centre of the city.

Baghdad had circular city walls in its original inception. Perhaps a sort of Caliphal 'Vatican City' ends up being set up there?
 
Most of the southern border of Canada is technically part of a circle. Canada itself looks more like a sector of a circle than a full circle, though.
 
When drawing up the Lateran Treaty setting up the Vatican City, instead of adopting the OTL border (which mostly follows the mediaeval walls) Mussolini simply draws a circle with a radius of 400m on a map of central Rome that includes all the most important buildings and makes a "take it or leave it" offer to the Pope...
 
So first we'll have to go back 300-400 years before the Industrial Revolution and get some cultists as the shadowy leaders of a nation. Have them gradually expand, they'll naturally form a circle. Trust me.
 
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