| Country | Longest border | % Correct |
|---|---|---|
| Belgium | France | 99%
|
| Estonia | Latvia | 99%
|
| Andorra | Spain | 99%
|
| France | Spain | 99%
|
| Denmark | Germany | 98%
|
| Finland | Russia | 98%
|
| Ireland | United Kingdom | 98%
|
| Belarus | Russia | 97%
|
| Austria | Germany | 96%
|
| Czech Republic | Germany | 96%
|
| Bosnia and Herzegovina | Croatia | 95%
|
| Latvia | Lithuania | 95%
|
| Bulgaria | Romania | 95%
|
| Norway | Sweden | 95%
|
| Monaco | France | 94%
|
| Croatia | Bosnia and Herzegovina | 93%
|
| Portugal | Spain | 93%
|
| Italy | Switzerland | 93%
|
| Liechtenstein | Switzerland | 93%
|
| Luxembourg | Belgium | 92%
|
| Greece | Bulgaria | 92%
|
| Netherlands | Germany | 91%
|
| Moldova | Ukraine | 91%
|
| Albania | Greece | 90%
|
| Macedonia | Greece | 90%
|
| Kosovo | Serbia | 90%
|
| Lithuania | Belarus | 89%
|
| Russia | Ukraine | 87%
|
| San Marino | Italy | 86%
|
| Romania | Bulgaria | 84%
|
| Germany | Czech Republic | 80%
|
| Vatican City | Italy | 80%
|
| Spain | Portugal | 80%
|
| Ukraine | Russia | 80%
|
| Hungary | Slovakia | 79%
|
| Montenegro | Bosnia and Herzegovina | 78%
|
| United Kingdom | Ireland | 78%
|
| Sweden | Norway | 78%
|
| Switzerland | Italy | 76%
|
| Slovenia | Croatia | 72%
|
| Poland | Czech Republic | 70%
|
| Slovakia | Hungary | 66%
|
| Serbia | Romania | 66%
|