| Length (mi) | Answer | % Correct |
|---|---|---|
| 981 | Ohio River | 100%
|
| 2,320 | Mississippi River | 96%
|
| 260 | Kentucky River | 89%
|
| 652 | Tennessee River | 82%
|
| 688 | Cumberland River | 79%
|
| 384 | Green River | 64%
|
| 303 | Licking River | 36%
|
| 159 | Tug Fork | 25%
|
| 164 | Levisa Fork | 14%
|
| 168 | North Fork | 11%
|