| Length | Country | Longest Border | % Correct |
|---|---|---|---|
| 1576 km | Ukraine | Russia | 100%
|
| 5300 km | Chile | Argentina | 99%
|
| 238 km | South Korea | North Korea | 99%
|
| 4677 km | Mongolia | China | 98%
|
| 784 km | Austria | Germany | 97%
|
| 1458 km | Iraq | Iran | 96%
|
| 1497 km | Niger | Nigeria | 95%
|
| 1458 km | Yemen | Saudi Arabia | 94%
|
| 740 km | Switzerland | Italy | 93%
|
| 1420 km | Ecuador | Peru | 91%
|
| 932 km | Bosnia | Croatia | 90%
|
| 2130 km | Vietnam | Laos | 90%
|
| 4053 km | India | Bangladesh | 88%
|
| 1600 km | Somalia | Ethiopia | 88%
|
| 247 km | North Macedonia | Greece | 88%
|
| 608 km | Romania | Bulgaria | 87%
|
| 787 km | Armenia | Azerbaijan | 83%
|
| 939 km | Moldova | Ukraine | 83%
|
| 769 km | Tanzania | Kenya | 80%
|
| 1000 km | Burkina Faso | Mali | 76%
|