| Country | Length | Longest Border | % Correct |
|---|---|---|---|
| United States | 8893 km | Canada | 100%
|
| Sweden | 1619 km | Norway | 99%
|
| North Korea | 1416 km | China | 98%
|
| Ireland | 360 km | United Kingdom | 97%
|
| Iran | 1458 km | Iraq | 95%
|
| China | 4677 km | Mongolia | 95%
|
| Spain | 1214 km | Portugal | 91%
|
| Sudan | 1937 km | South Sudan | 89%
|
| Russia | 6846 km | Kazakhstan | 88%
|
| Latvia | 453 km | Lithuania | 88%
|
| Belgium | 620 km | France | 87%
|
| Pakistan | 2912 km | India | 87%
|
| Costa Rica | 330 km | Panama | 87%
|
| Brazil | 3400 km | Bolivia | 86%
|
| Bolivia | 3400 km | Brazil | 86%
|
| Nepal | 1690 km | India | 86%
|
| Indonesia | 1782 km | Malaysia | 86%
|
| Oman | 676 km | Saudi Arabia | 86%
|
| Nicaragua | 922 km | Honduras | 83%
|
| Thailand | 1800 km | Myanmar | 83%
|
| Lebanon | 375 km | Syria | 79%
|
| Eritrea | 912 km | Ethiopia | 78%
|
| Germany | 815 km | Czech Republic | 76%
|
| Greece | 494 km | Bulgaria | 75%
|