| Letter | Answer | % Correct |
|---|---|---|
| A | Amazon | 93%
|
| N | Nile | 93%
|
| D | Danube | 88%
|
| Y | Yangtze | 86%
|
| M | Mississippi | 85%
|
| V | Volga | 78%
|
| C | Congo | 67%
|
| Z | Zambezi | 63%
|
| G | Ganges | 62%
|
| I | Indus | 51%
|
| R | Rio Grande | 40%
|
| O | Ob | 38%
|
| E | Elbe | 36%
|
| L | Lena | 32%
|
| B | Brahmaputra | 30%
|
| P | Paraná | 23%
|
| U | Ural | 15%
|
| H | Han | 7%
|
| Q | Qu | 6%
|
| F | Fraser | 5%
|
| T | Tocantins | 4%
|
| X | Xingu | 4%
|
| S | Selenga | 1%
|
| J | Japurá | 0%
|
| K | Kolyma | 0%
|
| W | Warburton | 0%
|