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20 Relatively Closest Non-Bordering Country Pairs by Geographical Center

Can you find the 20 pairs of non-bordering 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
Quiz by scambigol
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First submittedDecember 2, 2015
Last updatedDecember 2, 2015
Times taken27
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D / (R1 + R2)
Country A
Country B
0.75
Bahrain
Saudi Arabia
0.81
Thailand
Vietnam
0.85
Brunei
Indonesia
0.87
Cyprus
Turkey
0.87
Iran
Saudi Arabia
0.93
Iran
Kuwait
0.93
Benin
Ghana
0.97
Croatia
Italy
0.98
Bangladesh
China
0.98
Kazakhstan
Tajikistan
1.01
Gambia
Guinea-Bissau
1.04
Kyrgyzstan
Russia
1.05
Lebanon
Turkey
1.08
Egypt
Saudi Arabia
1.08
Trinidad and Tobago
Venezuela
1.10
Eritrea
Saudi Arabia
1.10
Iran
Qatar
1.11
Bahrain
Iran
1.11
Bosnia and Herzegovina
Italy
1.11
Austria
Croatia
+1
level 79
Dec 2, 2015
I understand how these are calculated, but they are still a very strange collection.
+1
level 70
Dec 3, 2015
True, they're mostly kind of countries 'somewhat englobed' by another yet not bordering
+1
level 46
Dec 3, 2015
Its really, really hard to believe that these are correct. So big countries.
+1
level 70
Dec 4, 2015
Thats because this quiz considers "relative" distance. If you reduce all sizes for example by 50%, the value stays the same