| Willoughby Run | |
| stream | |
|
Willoughby Run in April
|
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| Country | United States |
|---|---|
| State | Pennsylvania |
| Region | Adams County |
| Township | Cumberland |
Willoughby Run is a tributary of Marsh Creek in Adams County, Pennsylvania in the United States.
Willoughby Run flows southward between Herr Ridge and McPherson Ridge through the Gettysburg Battlefield.