| Rank | Continent | Drains to | Answer | % Correct |
|---|---|---|---|---|
| 4 | South America | Atlantic Ocean | Amazon River | 95%
|
| 8 | Africa | #2 | Nile River | 95%
|
| 9 | North America | #3 | Mississippi River | 91%
|
| 42 | Asia | Pacific Ocean | Yellow River | 90%
|
| 6 | Africa | Atlantic Ocean | Congo River | 88%
|
| 51 | Europe | #15 | Danube River | 88%
|
| 20 | Asia | Pacific Ocean | Yangtze River | 87%
|
| 23 | Asia | Indian Ocean | Meghna-Padma-Ganges-Brahmaputra River | 84%
|
| 38 | Asia | #23 | Ganges River | 83%
|
| 26 | Europe | #7 | Volga River | 82%
|
| 5 | North America | Atlantic Ocean | Hudson Bay | 78%
|
| 2 | Multiple | Atlantic Ocean | Mediterranean Sea | 77%
|
| 29 | North America | #9 | Missouri River | 77%
|
| 17 | Africa | Atlantic Ocean | Niger River | 77%
|
| 48 | Asia | Pacific Ocean | Mekong River | 75%
|
| 28 | Africa | Indian Ocean | Zambezi River | 74%
|
| 32 | Asia | Indian Ocean | Indus River | 73%
|
| 3 | Multilpe | Atlantic Ocean | Gulf of Mexico-Caribbean Sea | 70%
|
| 11 | Asia | Arctic Ocean | Ob River | 70%
|
| 15 | Multiple | #2 | Black Sea | 69%
|
| 7 | Multiple | n/a | Caspian Sea | 69%
|
| 35 | North America | Atlantic Ocean | St. Lawrence River | 69%
|
| 47 | North America | Pacific Ocean | Yukon River | 65%
|
| 10 | South America | Atlantic Ocean | Rio de la Plata | 64%
|
| 18 | Asia | Pacific Ocean | Amur River | 61%
|
| 21 | Europe | Atlantic Ocean | Baltic Sea | 61%
|
| 12 | South America | #10 | Parana River | 61%
|
| 19 | North America | Arctic Ocean | Mackenzie River | 56%
|
| 13 | Asia | Arctic Ocean | Yenisei River | 56%
|
| 16 | Asia | Arctic Ocean | Lena River | 55%
|
| 46 | Europe | Atlantic Ocean | North Sea | 55%
|
| 50 | North America | #35 | Great Lakes | 52%
|
| 41 | South America | Atlantic Ocean | Orinoco River | 52%
|
| 34 | Oceania | Southern Ocean | Murray-Darling basin | 51%
|
| 43 | Africa | Atlantic Ocean | Orange River | 51%
|
| 24 | Asia | n/a | Aral Sea | 40%
|
| 27 | Asia | Indian Ocean | Persian Gulf | 40%
|
| 31 | South America | #12 | Paraguay River | 38%
|
| 14 | Africa | n/a | Chad Basin | 34%
|
| 37 | Africa | n/a | Lake Chad | 34%
|
| 22 | Asia | #11 | Irtysh River | 26%
|
| 40 | North America | #19 | Great Slave Lake | 25%
|
| 33 | North America | #5 | Nelson River | 22%
|
| 39 | North America | #33 | Lake Winnipeg | 17%
|
| 25 | South America | #4 | Madeira River | 13%
|
| 30 | Oceania | n/a | Lake Eyre Basin | 12%
|
| 36 | Asia | #13 | Angara River | 9%
|
| 44 | Africa | #6 | Kasai River | 6%
|
| 49 | Africa | Indian Ocean | Jubba-Shebelle basin | 5%
|
| 45 | Asia | n/a | Tarim Basin | 4%
|