| Length (km) | Flows through | River | % Correct |
|---|---|---|---|
| 2,330 | USA, Mexico | Colorado | 100%
|
| 2,000 | USA, Canada | Columbia | 100%
|
| 3,767 | USA | Missouri | 100%
|
| 3,051 | USA, Mexico | Rio Grande | 100%
|
| 2,364 | USA | Arkansas | 89%
|
| 1,740 | USA | Snake | 78%
|
| 1,152 | USA | North Platte | 44%
|
| 1,375 | Canada | Fraser | 33%
|
| 1,170 | USA | Green | 22%
|
| 1,080 | USA | Yellowstone | 22%
|
| 1,115 | Canada | Liard | 11%
|
| 1,923 | Canada | Peace | 11%
|
| 1,231 | Canada | Athabasca | 0%
|
| 1,173 | USA, Canada | Milk | 0%
|
| 1,287 | Canada | North Saskatchewan | 0%
|
| 1,490 | USA | Pecos | 0%
|
| 1,392 | Canada | South Saskatchewan | 0%
|