| Letter | Length (km) | River | % Correct |
|---|---|---|---|
| A | 6,400 | Amazon | 100%
|
| N | 6,650 | Nile | 100%
|
| D | 2,850 | Danube | 92%
|
| Y | 6,300 | Yangtze | 88%
|
| M | 6,275 | Mississippi | 87%
|
| B | 3,969 | Brahmaputra (Ganges) | 83%
|
| V | 3,645 | Volga | 78%
|
| I | 3,610 | Indus | 73%
|
| Z | 2,574 | Zambezi | 73%
|
| C | 4,700 | Congo | 67%
|
| R | 3,057 | Rio Grande | 63%
|
| O | 5,410 | Ob | 57%
|
| S | 3,596 | Shatt al-Arab | 52%
|
| L | 4,400 | Lena | 45%
|
| P | 4,880 | Parana | 43%
|
| X | 1,957 | Xijiang | 35%
|
| E | 1,165 | Elbe | 27%
|
| U | 2,428 | Ural | 27%
|
| J | 250 | Jordan | 18%
|
| T | 3,650 | Tocantins | 12%
|
| F | 1,375 | Fraser | 3%
|
| K | 2,130 | Kolyma | 3%
|
| G | 1,465 | Godavari | 2%
|
| H | 1,150 | Helmand | 0%
|
| W | 1,020 | Western Dvina | 0%
|