| Area (square miles) | Watershed | % Correct |
|---|---|---|
| 1,256,706 | Nile | 100%
|
| 2,372,670 | Amazon | 97%
|
| 1,236,371 | Mississippi | 92%
|
| 1,440,501 | Congo | 88%
|
| 544,771 | Volga | 86%
|
| 664,942 | Yangtze | 86%
|
| 873,263 | Niger | 82%
|
| 417,654 | Indus | 72%
|
| 514,510 | Zambezi | 63%
|
| 405,267 | Saint Lawrence | 55%
|
| 1,151,547 | Ob | 54%
|
| 405,452 | Murray | 52%
|
| 697,000 | Mackenzie | 51%
|
| 997,188 | Parana | 51%
|
| 745,160 | Amur | 46%
|
| 890,638 | Lena | 46%
|
| 368,216 | Orinoco | 37%
|
| 986,255 | Yenisei | 37%
|
| 414,000 | Nelson | 14%
|
| 626,000 | Meghna | 0%
|