Roundest and most rectangular countries

Enter the fifteen roundest and most rectangular countries.
Roundness/rectangularity is determined by the percentage overlap of a country's actual territory with a rectangle or circle of the same area optimally superimposed over it.
Sources: http://pappubahry.com/misc/rectangles/ ; https://gciruelos.com/what-is-the-roundest-country.html
Quiz by MiracleMax
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Last updated: July 30, 2018
First submittedJuly 30, 2018
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Roundest Countries
Sierra Leone
Nauru
Zimbabwe
Vatican City
Poland
Ivory Coast
Suriname
Swaziland
Uruguay
Romania
Sudan
Ethiopia
Botswana
San Marino
Kosovo
Most Rectangular Countries
Egypt
Vatican City
Lesotho
Yemen
Ghana
Macedonia
Ivory Coast
Poland
Nauru
Sudan
Swaziland
Uruguay
Sierra Leone
Turkey
Angola
+2
Level 71
Jul 30, 2018
Interestingly, the same features that make a country "round" also lend to the country being "rectangular", hence the large amount of overlap between the two categories. This method of evaluating convergence with a shape for any shape prefers countries with regular, straight borders, a high area to perimeter ratio and no major irregularities such as Alaska, Sicily or the various parts of Malaysia. The few that are rectangular but not round are really remarkably rectangular, like Egypts two perfectly-straight borders which are at almost a 90% angle, and Turkey, which fits very well into a rectangular box.