| km | mi | Answer | % Correct | |
|---|---|---|---|---|
| N | 6,400 | 3,976 | Amazon | 97%
|
| E | 6,650 | 4,130 | Nile | 97%
|
| I | 6,275 | 3,902 | Mississippi | 90%
|
| O | 4,700 | 2,922 | Congo | 83%
|
| G | 4,350 | 2,705 | Mekong | 72%
|
| A | 4,880 | 3,030 | Paraná | 66%
|
| W | 5,464 | 3,395 | Yellow | 66%
|
| B | 5,410 | 3,364 | Ob | 55%
|
| R | 4,444 | 2,763 | Amur | 52%
|
| Y | 5,539 | 3,445 | Yenisey | 38%
|
| L | 2,428 | 1,509 | Ural | 34%
|
| D | 2,188 | 1,360 | Red (USA) | 28%
|
| S | 3,650 | 2,270 | Tocantins | 24%
|
| H | 4,248 | 2,640 | Irtysh | 17%
|
| U | 2,100 | 1,305 | Xingu | 7%
|
| T | 800 | 500 | Chubut | 3%
|
| P | 460 | 290 | Swakop | 3%
|
| C | 731 | 454 | Apurímac | 0%
|
| F | 725 | 450 | Chelif | 0%
|
| M | 2,450 | 1,522 | Ishim | 0%
|
| X | 450 | 280 | Kalix | 0%
|
| K | 2,292 | 1,424 | Olenyok | 0%
|
| J | 1,372 | 852 | Sutlej | 0%
|
| Z | 1,401 | 871 | Taz | 0%
|
| V | 844 | 524 | Volkhov | 0%
|