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20 Relatively Closest Country Pairs by Geographical Center

Can you find the 20 pairs of countries that are relatively closest together? Distance is measured between their geographical centers and is then divided by the sum of R1 and R2 which are the radii of circles having the same area as the two countries
Data from Portland State University (https://www.pdx.edu/econ/country-geography-data), for missing countries from CIA (https://www.cia.gov/library/publications/the-world-factbook/fields/2011.html)
Country A comes before Country B in alphabetical order
Hint: look for countries that englobe another or thin long ones that are next to each other
Quiz by scambigol
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Last updated: October 17, 2015
First submittedOctober 17, 2015
Times taken36
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D / (R1 + R2)
Country A
Country B
0.35
Italy
Vatican City
0.38
Italy
San Marino
0.38
Argentina
Chile
0.44
Lesotho
South Africa
0.46
China
Mongolia
0.51
Gambia
Senegal
0.52
South Sudan
Sudan
0.52
Guinea
Sierra Leone
0.54
Afghanistan
Pakistan
0.55
Canada
United States
0.55
Moldova
Ukraine
0.56
Laos
Vietnam
0.56
Mongolia
Russia
0.56
Turkmenistan
Uzbekistan
0.57
Bosnia and Herzegovina
Croatia
0.57
Indonesia
Malaysia
0.59
Hungary
Slovakia
0.60
Benin
Togo
0.60
Kazakhstan
Uzbekistan
0.60
Gabon
Republic of the Congo
+1
level 60
Oct 17, 2015
Good idea, yet (as always!) very complicated. :)