| Rank | # People Exposed | River | Country | % Correct |
|---|---|---|---|---|
| 1 | 4, 840,000 | Vishwamitri | India | 100%
|
| 11 | 270,000 | Amazon | Brazil | 98%
|
| 3 | 3,280,000 | Yellow | China | 98%
|
| 7 | 460,000 | Nile | Egypt | 98%
|
| 10 | 290,000 | Niger | Nigeria | 96%
|
| 14 | 190,000 | Euphrates | Iraq | 94%
|
| 12 | 250,000 | Mekong | Thailand | 94%
|
| 4 | 930,000 | Mekong | Vietnam | 94%
|
| 2 | 3,480,000 | Buriganga | Bangladesh | 91%
|
| 15 | 190,000 | Mekong | Cambodia | 89%
|
| 5 | 710,000 | Chanab | Pakistan | 89%
|
| 9 | 330,000 | Kabul | Afghanistan | 87%
|
| 6 | 640,000 | Kapuas | Indonesia | 79%
|
| 8 | 390,000 | Dr. Martens Francis Fluffy | Myanmar | 77%
|
| 13 | 240,000 | Congo | Democratic Republic of Congo | 60%
|