| Rank | Continent | Drains to | Answer | % Correct |
|---|---|---|---|---|
| 1 | South America | Atlantic Ocean | Amazon | 99%
|
| 3 | Africa | Mediterranean Sea | Nile | 99%
|
| 4 | North America | Gulf of Mexico | Mississippi | 97%
|
| 2 | Africa | Atlantic Ocean | Congo | 96%
|
| 28 | Asia | Pacific Ocean | Yellow | 93%
|
| 17 | Europe | Caspian Sea | Volga | 90%
|
| 34 | Europe | Black Sea | Danube | 89%
|
| 26 | Asia | #15 | Ganges | 88%
|
| 15 | Asia | Bay of Bengal | Meghna-Padma-Ganges-Brahmaputra | 88%
|
| 10 | Africa | Atlantic Ocean | Niger | 86%
|
| 13 | Asia | Pacific Ocean | Yangtze | 85%
|
| 32 | Asia | Pacific Ocean | Mekong | 80%
|
| 19 | North America | #4 | Missouri | 80%
|
| 21 | Asia | Arabian Sea | Indus | 77%
|
| 36 | Asia | Persian Gulf | Tigris-Euphrates | 77%
|
| 46 | North America | Gulf of Mexico | Rio Grande | 76%
|
| 40 | North America | Gulf of California | Colorado | 75%
|
| 18 | Africa | Indian Ocean | Zambezi | 72%
|
| 24 | North America | Atlantic Ocean | Saint Lawrence | 67%
|
| 6 | Asia | Arctic Ocean | Ob | 66%
|
| 31 | North America | Bering Sea | Yukon | 66%
|
| 5 | South America | Atlantic Ocean | Rio de la Plata | 65%
|
| 49 | Europe | Black Sea | Dnieper | 62%
|
| 29 | Africa | Atlantic Ocean | Orange | 59%
|
| 11 | Asia | Pacific Ocean | Amur | 58%
|
| 9 | Asia | Arctic Ocean | Lena | 58%
|
| 7 | South America | #5 | Parana | 58%
|
| 23 | Oceania | Southern Ocean | Murray | 54%
|
| 27 | South America | Atlantic Ocean | Orinoco | 50%
|
| 42 | North America | Pacific Ocean | Columbia | 49%
|
| 12 | North America | Arctic Ocean | Mackenzie | 44%
|
| 8 | Asia | Arctic Ocean | Yenisei | 41%
|
| 20 | South America | #7 | Paraguay | 36%
|
| 43 | Asia | #15 | Brahmaputra | 34%
|
| 48 | Asia | Aral Sea | Amu Darya | 26%
|
| 35 | Asia | Aral Sea | Syr Darya | 24%
|
| 38 | Africa | n/a | Okavango | 21%
|
| 14 | Asia | #6 | Irtysh | 19%
|
| 44 | South America | Atlantic Ocean | Sao Francisco | 19%
|
| 39 | South America | #1 | Rio Negro | 18%
|
| 37 | South America | Atlantic Ocean | Tocantins | 16%
|
| 16 | South America | #1 | Madeira | 13%
|
| 22 | North America | Hudson Bay | Nelson | 13%
|
| 45 | Africa | #2 | Ubangi | 12%
|
| 50 | South America | #1 | Xingu | 11%
|
| 25 | Asia | #8 | Angara | 10%
|
| 41 | Asia | Arctic Ocean | Kolyma | 8%
|
| 33 | Africa | Indian | Jubba-Shebelle | 6%
|
| 30 | Africa | #2 | Kasai | 6%
|
| 47 | Africa | Lake Chad | Chari | 5%
|