| Hint | Answer | % Correct |
|---|---|---|
| AZ-CA | Colorado River | 100%
|
| IL-MO | Mississippi River | 100%
|
| WA-OR (partial) | Columbia River | 88%
|
| IA-NE | Missouri River | 88%
|
| IN-KY | Ohio River | 75%
|
| OK-TX (partial) | Red River | 75%
|
| ID-MT (mostly) | Bitterroot Range | 63%
|
| VT-NH (mostly) | Connecticut River | 50%
|
| PA-NJ | Delaware River | 50%
|
| MD-VA (mostly) | Potomac River | 50%
|
| SC-GA (mostly) | Savannah River | 50%
|
| VT-NY (partial) | Lake Champlain | 38%
|