| Neighbor | Border Length (km) | Country | % Correct |
|---|---|---|---|
| United States | 8,893 | Canada | 100%
|
| United Kingdom | 360 | Ireland | 97%
|
| Spain | 1,214 | Portugal | 97%
|
| North Korea | 238 | South Korea | 97%
|
| Germany | 68 | Denmark | 93%
|
| Italy | 39 | San Marino | 93%
|
| South Africa | 909 | Lesotho | 90%
|
| France | 4.4 | Monaco | 90%
|
| Ireland | 360 | United Kingdom | 90%
|
| Saudi Arabia | 60 | Qatar | 87%
|
| Italy | 3.2 | Vatican City | 87%
|
| Malaysia | 381 | Brunei | 83%
|
| Haiti | 360 | Dominican Republic | 83%
|
| Dominican Republic | 360 | Haiti | 83%
|
| Indonesia | 820 | Papua New Guinea | 80%
|
| Senegal | 740 | The Gambia | 80%
|
| Indonesia | 228 | Timor-Leste | 73%
|