| States | River | % Correct |
|---|---|---|
| Mississippi and Louisiana | Mississippi River | 97%
|
| Indiana and Kentucky | Ohio River | 88%
|
| Arizona and California | Colorado River | 81%
|
| Maryland and Virginia | Potomac River | 78%
|
| Washington and Oregon | Columbia River | 76%
|
| Oklahoma and Texas | Red River | 59%
|
| Minnesota and Wisconsin (south) | Mississippi River | 58%
|
| Nebraska and Iowa | Missouri River | 56%
|
| Illinois and Iowa | Mississippi River | 52%
|
| Oregon and Idaho | Snake River | 52%
|
| South Carolina and Georgia | Savannah River | 41%
|
| New Hampshire and Vermont | Connecticut River | 30%
|
| Minnesota and North Dakota | Red River of the North | 26%
|
| Alabama and Georgia | Chattahoochee River | 20%
|
| Texas and Louisiana | Sabine River | 17%
|
| Minnesota and Wisconsin (north) | St. Croix River | 13%
|
| Kentucky and West Virginia | Tug Fork River | 11%
|
| Georgia and Florida | St. Marys River | 10%
|