| Border/area ratio (km/km^2) | Countries | % Correct | |
|---|---|---|---|
| 1 | 7.2727 | Vatican City | 100%
|
| 5 | 0.25705 | Andorra | 95%
|
| 4 | 0.475 | Liechtenstein | 95%
|
| 6 | 0.13882 | Luxembourg | 95%
|
| 2 | 2.20 | Monaco | 95%
|
| 3 | 0.6393 | San Marino | 95%
|
| 7 | 0.06608 | Brunei | 84%
|
| 13 | 0.04525 | Montenegro | 84%
|
| 8 | 0.06580 | Slovenia | 84%
|
| 10 | 0.06439 | Kosovo | 74%
|
| 17 | 0.04104 | Moldova | 68%
|
| 19 | 0.03499 | Burundi | 63%
|
| 20 | 0.03391 | Rwanda | 63%
|
| 11 | 0.04896 | Israel | 58%
|
| 14 | 0.04486 | Switzerland | 58%
|
| 9 | 0.06552 | Gambia | 53%
|
| 15 | 0.04347 | Lebanon | 53%
|
| 16 | 0.04216 | Armenia | 47%
|
| 12 | 0.04536 | Belgium | 47%
|
| 18 | 0.03882 | Croatia | 47%
|