| Length (Km) | World Capitals | World River | % Correct |
|---|---|---|---|
| 2,888 | Belgrade | Budapest | Bratislava | Vienna | Danube | 100%
|
| 6,650 | Cairo | Khartoum | Juba | Nile | 100%
|
| 4,700 | Kinshasa | Brazzaville | Congo | 99%
|
| 4,350 | Phnom Penh | Vientiane | Mekong | 94%
|
| 4,200 | Niamey | Bamako | Niger | 92%
|
| 2,287 | Kiev | Dnieper | 84%
|
| 1,950 | Baghdad | Tigris | 84%
|
| 2,704 | Dhaka | Ganges | 78%
|
| 1,600 | Khartoum | Blue Nile | 69%
|
| 4,880 | Buenos Aires | Montevideo | Rio de la Plata | 69%
|
| 2,549 | Asuncion | Paraguay | 59%
|
| 2,270 | Bangui | Ubangi | 20%
|
| 2,450 | Nur-Sultan | Ishim | 13%
|
| 1,515 | Tbilisi | Kura (Mtkvari) | 6%
|
| 1,485 | Canberra | Murrumbidgee | 6%
|
| 2,500 | Sucre | Pilcomayo | 4%
|