| Country | Biggest bordering country | % Correct |
|---|---|---|
| Luxembourg | France | 95%
|
| United States | Canada | 93%
|
| Uruguay | Brazil | 91%
|
| United Kingdom* | Ireland | 91%
|
| North Korea | Russia | 91%
|
| Macedonia | Greece | 90%
|
| Russia | China | 89%
|
| Norway | Russia | 87%
|
| Turkmenistan | Kazakhstan | 86%
|
| Saudi Arabia | Yemen | 86%
|
| El Salvador | Honduras | 85%
|
| Cambodia | Thailand | 85%
|
| Poland | Russia | 84%
|
| Moldova | Ukraine | 84%
|
| Montenegro | Serbia | 83%
|
| Costa rica | Nicaragua | 82%
|
| Panama | Colombia | 81%
|
| Armenia | Iran | 78%
|
| Tajikistan | China | 74%
|
| D. R. Congo | Angola | 72%
|