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The Delaware Boundary Markers historic district is located along the state boundary lines between Delaware and Maryland, and between Delaware and Pennsylvania.The district includes 94 contributing sites along the Mason–Dixon line and includes the Transpeninsular Line, Post Marked West site, Tangent Line, the Arc Corner, and the Twelve-Mile Circle.
The Delaware–Maryland–Pennsylvania Tri-State Point is the meeting of the northwestern corner of Delaware, the northeastern corner of Maryland, and the southern edge of Pennsylvania. [1] A wooden marker was placed in 1765, by Charles Mason and Jeremiah Dixon , and was replaced with a stone marker in 1849.
The Mason-Dixon Trail passing the Arc Corner Monument in the Delaware Wedge. The Mason-Dixon Trail then turns north and follows various roads in the Newark area, with segments through several public parks. The trail follows a lengthy and meandering route through scenic areas in White Clay Creek State Park in the Delaware Wedge area.
The Arc Corner surveyed by Mason and Dixon is also within the park, and is marked by a monument erected in 1892. [18] The Tri-State Trail connects White Clay Creek State Park to the 1849 Tri-State Monument , where the borders of Delaware, Pennsylvania, and Maryland meet. [ 19 ]
Tri-State Monument, dated 1849 Arc Corner Monument, dated 1892. By simple geometry, the Wedge fit more logically as a part of Delaware, which exercised jurisdiction of the area. In 1849, Lt. Col. James Duncan Graham of the U.S. Army Corps of Topographical Engineers resurveyed the northeast corner of Maryland and the Twelve-Mile Circle. [3]
The Twelve-Mile Circle is an approximately circular arc that forms most of the boundary between Delaware and Pennsylvania. It is a combination of different circular arcs that have been feathered together. [1] [2] It is nominally a circle with a variable radius of approximately 12 miles (19 km) centered in the town of New Castle, Delaware. [3]