| km² | River Basin | % Correct |
|---|---|---|
| 3.7 mil | Congo | 100%
|
| 2.3 mil | Niger | 100%
|
| 3.3 mil | Nile | 98%
|
| 1.3 mil | Zambezi | 98%
|
| 941 k | Orange | 96%
|
| 420 k | Senegal | 94%
|
| 407 k | Volta | 92%
|
| 421 k | Limpopo | 81%
|
| 77.1 k | Gambia | 75%
|
| 358 k | Okavango | 58%
|
| 498 k | Jubba | 52%
|
| 549 k | Chari | 42%
|
| 337 k | Shebelle | 33%
|
| 68.6 k | Ekuma | 21%
|
| 224 k | Ogooué | 19%
|
| 54.0 k | Cross | 13%
|
| 115 k | Draa | 13%
|
| 126 k | Tana | 13%
|
| 150 k | Cuanza | 10%
|
| 140 k | Sanaga | 10%
|
| 61.7 k | Kouilou-Niari | 8%
|
| 156 k | Ruvuma | 8%
|
| 74.5 k | Sassandra | 8%
|
| 110 k | Awash | 6%
|
| 66.2 k | Barka | 6%
|
| 51.0 k | Batha | 6%
|
| 107 k | Cunene | 6%
|
| 78.0 k | Komoé | 6%
|
| 55.8 k | Mangoky | 6%
|
| 70.0 k | Nugaal | 6%
|
| 86.7 k | Omo | 6%
|
| 204 k | Rufiji | 6%
|
| 106 k | Save | 6%
|
| 99.7 k | Bandama | 4%
|
| 60.8 k | Lúrio | 4%
|
| 54.0 k | Moulouya | 4%
|
| 113 k | Okwa | 4%
|
| 65.0 k | Saguia el-Hamra | 4%
|
| 95.0 k | Saoura | 4%
|
| 183 k | Yobe | 4%
|