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In page Lancaster County, Pennsylvania:

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Lying just north of the Mason-Dixon line and bordered by the Susquehanna River, which had been a traditional route from the Chesapeake Bay watershed into the heart of what became Pennsylvania, Lancaster County was a significant destination of the Underground Railroad in the antebellum years. Many residents of German descent opposed slavery and cooperated in aiding fugitive slaves. Local Lancaster County resident Charles Spotts found 17 stations.[4] They included hiding places with trap doors, hidden vaults, a cave, and one with a brick tunnel leading to Octoraro Creek, a tributary of the Susquehanna.[citation needed]