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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]
The Mason–Dixon line is a demarcation line separating four U.S. states: Pennsylvania, Maryland, Delaware and West Virginia. It was surveyed between 1763 and 1767 by Charles Mason and Jeremiah Dixon as part of the resolution of a border dispute involving Maryland, Pennsylvania, and Delaware in the colonial United States. [1]
The Transpeninsular Line (at approximately 38°27′ N) is a surveyed line, the eastern half of which forms the north–south border between Delaware and Maryland. The border turns roughly north from the midpoint of the line towards the Twelve-Mile Circle, which forms much of the remainder of the Delaware land border.
The border between Maryland and Delaware, which resulted from the 80-year-long Penn–Calvert Boundary Dispute, consists of the east–west Transpeninsular Line and the perpendicular north–south portion of the Mason–Dixon line extending north to just beyond its tangential intersection with the Twelve-Mile Circle which forms Delaware's ...
Delaware County is roughly diamond- or kite-shaped, with the four sides formed by the Chester County boundary to the northwest, the boundary with the state of Delaware, a portion of the "Twelve-Mile Circle") to the southwest, the Delaware River, forming the border with the state of New Jersey) to the southeast, and the city of Philadelphia and ...
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 Wedge (or Delaware Wedge) is a 1.068-square-mile (684-acre; 2.77 km 2) [1] tract of land along the borders of Delaware, Maryland and Pennsylvania. Ownership of the land was disputed until 1921; it is now recognized as part of Delaware. [ 2 ]
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.