Willoughby Run is a tributary of Marsh Creek in Adams County, Pennsylvania in the United States.[1]
| Willoughby Run | |
|---|---|
 | |
| Location | |
| Country | United States |
| State | Pennsylvania |
| Region | Adams County |
| Township | Cumberland |
Willoughby Run flows southward between Herr Ridge and McPherson Ridge through the Gettysburg Battlefield.
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39°47′05″N 77°16′37″W / 39.78472°N 77.27694°W
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