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30 Bordering Country Pairs Relatively Further Away by Geographical Center

Can you find the pairs of bordering countries that are relatively further away? Distance is measured between their geographical centers and is then divided by 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; overseas borders not considered
The row highlighted in yellow is a disputed border
Hint: look for borders at the tip of 'long' countries or at countries with islands that make their centers spread away
Quiz by scambigol
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Last updated: December 5, 2015
First submittedDecember 5, 2015
Times taken36
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D / (R1 + R2)
COUNTRY A
COUNTRY B
2.77
Indonesia
Papua New Guinea
2.63
Chile
Peru
2.57
Malaysia
Thailand
2.13
Austria
Liechtenstein
2.04
Bolivia
Chile
1.98
Djibouti
Eritrea
1.96
Israel
Lebanon
1.93
Mozambique
Swaziland
1.84
Belize
Mexico
1.71
Poland
Russia
1.71
Croatia
Montenegro
1.67
Costa Rica
Panama
1.65
Austria
Switzerland
1.65
Georgia
Russia
1.64
Lithuania
Russia
D / (R1 + R2)
COUNTRY A
COUNTRY B
1.62
Azerbaijan
Turkey
1.62
Azerbaijan
Russia
1.60
Guatemala
Mexico
1.58
Latvia
Russia
1.57
East Timor
Indonesia
1.56
Israel
Syria
1.55
Afghanistan
China
1.54
Qatar
United Arab Emirates
1.54
Belarus
Russia
1.54
Slovakia
Ukraine
1.53
Greece
Turkey
1.53
Estonia
Russia
1.53
Iran
Turkey
1.50
Russia
Ukraine
1.50
Kyrgyzstan
Uzbekistan
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