| Region | Bordering country | % Correct |
|---|---|---|
| Montana | Canada | 98%
|
| Northern Ireland | Ireland | 97%
|
| Texas | Mexico | 95%
|
| Brandenburg | Poland | 94%
|
| British Columbia | United States | 94%
|
| North Sinai | Israel | 92%
|
| Lombardy | Switzerland | 92%
|
| Castile and León | Portugal | 91%
|
| Donetsk Oblast | Russia | 86%
|
| Rajasthan | Pakistan | 83%
|
| Groningen | Germany | 80%
|
| Guangxi | Vietnam | 77%
|
| Chiapas | Guatemala | 75%
|
| Eastern Cape | Lesotho | 72%
|
| Mato Grosso | Bolivia | 69%
|
| Amur Oblast | China | 67%
|
| Tripolitania | Tunisia | 66%
|
| Republic of Karelia | Finland | 63%
|
| Epirus | Albania | 59%
|
| West Kalimantan | Malaysia | 55%
|