| LENGTH | COUNTRIES | % Correct |
|---|---|---|
| 5,300 km | Argentina-Chile | 100%
|
| 3,400 km | Bolivia-Brazil | 82%
|
| 2,200 km | Brazil-Venezuela | 73%
|
| 2,050 km | Colombia-Venezuela | 66%
|
| 1,643 km | Brazil-Colombia | 60%
|
| 1,880 km | Argentina-Paraguay | 55%
|
| 985 km | Brazil-Uruguay | 55%
|
| 1,560 km | Brazil-Peru | 53%
|
| 1,290 km | Brazil-Paraguay | 52%
|
| 1,420 km | Ecuador-Peru | 52%
|
| 1,119 km | Brazil-Guyana | 48%
|
| 160 km | Chile-Peru | 48%
|
| 600 km | Guyana-Suriname | 48%
|
| 579 km | Argentina-Uruguay | 47%
|
| 900 km | Bolivia-Peru | 47%
|
| 597 km | Brazil-Suriname | 47%
|
| 590 km | Colombia-Ecuador | 47%
|
| 743 km | Guyana-Venezuela | 45%
|
| 861 km | Bolivia-Chile | 44%
|
| 750 km | Bolivia-Paraguay | 42%
|
| 1,496 km | Colombia-Peru | 40%
|
| 1,224 km | Argentina-Brazil | 37%
|
| 510 km | France (French Guiana)-Suriname | 37%
|
| 673 km | Brazil-France (French Guiana) | 35%
|
| 832 km | Argentina-Bolivia | 34%
|