Pennsylvania-Maryland-Delaware Tri-State Marker, Boundary marker at Pennsylvania-Maryland-Delaware intersection, United States
The Pennsylvania-Maryland-Delaware Tri-State Marker stands at the exact point where three state boundaries meet. The stone monument sits within a natural preserve area accessible by a network of walking paths that lead visitors to this geographic meeting point.
Charles Mason and Jeremiah Dixon placed the original wooden marker in 1765 to establish these state boundaries. The wooden structure was replaced with the current stone monument in 1849.
The marker forms part of the Delaware Boundary Markers historic district, earning recognition on the National Register of Historic Places in 1975.
Visitors reach the marker via a trail system that winds through a natural preserve area. The pathways are designed to guide you through the landscape to this specific geographic point.
This location is one of only a handful of points in the United States where visitors can stand in three different states at the same time. This geographic rarity draws people seeking to experience this unusual physical boundary condition firsthand.
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