| Country | km² | Answer | mi² | % Correct |
|---|---|---|---|---|
| Germany | 1,2 k | Rhine | 760 | 100%
|
| China | 6,4 k | Yangtze | 4,0 k | 100%
|
| China | 5,5 k | Yellow | 3,4 k | 100%
|
| Germany | 2,9 k | Danube | 1,8 k | 95%
|
| Sudan | 4,4 k | Nile | 2,7 k | 95%
|
| United Kingdom | 346 | Thames | 215 | 95%
|
| Italy | 652 | Po | 405 | 90%
|
| South Africa | 2,4 k | Orange | 1,5 k | 86%
|
| Canada | 3,1 k | St. Lawrence | 1,9 k | 86%
|
| Canada | 3,2 k | Yukon | 2,0 k | 71%
|
| Germany | 1,1 k | Elbe | 680 | 67%
|
| China | 4,4 k | Mekong | 2,7 k | 67%
|
| Russia | 3,7 k | Ob | 2,3 k | 67%
|
| United Kingdom | 354 | Severn | 220 | 67%
|
| Italy | 405 | Tiber | 252 | 67%
|
| Russia | 4,3 k | Lena | 2,7 k | 62%
|
| Canada | 4,2 k | Mackenzie | 2,6 k | 57%
|
| South Africa | 1,8 k | Limpopo | 1,1 k | 52%
|
| Sudan | 3,7 k | White Nile | 2,3 k | 52%
|
| Slovenia | 947 | Sava | 588 | 48%
|
| United Kingdom | 297 | Trent | 185 | 38%
|
| Slovenia | 707 | Drava | 439 | 33%
|
| Russia | 4,2 k | Irtysh | 2,6 k | 14%
|
| Sudan | 805 | Atbarah | 500 | 10%
|
| Slovenia | 438 | Mura | 272 | 10%
|
| South Africa | 1,5 k | Vaal | 906 | 10%
|
| Italy | 410 | Adige | 250 | 5%
|