| Region | Largest | Second-Largest | % Correct |
|---|---|---|---|
| South America | São Paulo | Buenos Aires | 97%
|
| Scotland | Glasgow | Edinburgh | 94%
|
| Québec | Montréal | Québec City | 94%
|
| Hispaniola | Santo Domingo | Port-au-Prince | 91%
|
| Baltic States | Riga | Vilnius | 91%
|
| Scandinavia | Stockholm | Copenhagen | 89%
|
| European Union | Paris | Madrid | 89%
|
| Arab League | Cairo | Riyadh | 86%
|
| Russian Far East | Khabarovsk | Vladivostok | 86%
|
| Mainland Southeast Asia | Bangkok | Ho Chi Minh City | 83%
|
| Pennsylvania | Philadelphia | Pittsburgh | 83%
|
| Central Asia | Tashkent | Almaty | 77%
|
| Southeast Asia | Jakarta | Manila | 74%
|
| Central America | Guatemala City | San José | 74%
|
| West Africa | Lagos | Abidjan | 71%
|
| Queensland | Brisbane | Gold Coast | 66%
|
| Manchuria | Shenyang | Harbin | 66%
|
| Andalusia | Seville | Málaga | 66%
|
| Sicily | Palermo | Catania | 57%
|
| Baja California | Tijuana | Mexicali | 43%
|
| Gujarat | Ahmedabad | Surat | 34%
|
| Polynesia | Auckland | Honolulu | 31%
|
| Kyushu | Fukuoka | Kitakyushu | 31%
|
| Sumatra | Medan | Palembang | 26%
|