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  2. Twelve-Mile Circle - Wikipedia

    en.wikipedia.org/wiki/Twelve-Mile_Circle

    The diagram shows the survey lines involved in the disputes, not current borders. 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]

  3. Transpeninsular Line - Wikipedia

    en.wikipedia.org/wiki/Transpeninsular_Line

    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.

  4. Delaware Boundary Markers - Wikipedia

    en.wikipedia.org/wiki/Delaware_Boundary_Markers

    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.

  5. Mason–Dixon line - Wikipedia

    en.wikipedia.org/wiki/Mason–Dixon_line

    Maryland's border with Delaware was to be based on the Transpeninsular Line and the Twelve-Mile Circle around New Castle. The Pennsylvania–Maryland border was defined as the line of latitude 15 miles (24 km) south of the southernmost house in Philadelphia (on what is today South Street).

  6. Delaware Wedge - Wikipedia

    en.wikipedia.org/wiki/Delaware_wedge

    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 ]

  7. Category:Borders of Pennsylvania - Wikipedia

    en.wikipedia.org/wiki/Category:Borders_of...

    Pages in category "Borders of Pennsylvania" The following 14 pages are in this category, out of 14 total. ... Delaware–Maryland–Pennsylvania Tri-State Point; M.

  8. Geography of Pennsylvania - Wikipedia

    en.wikipedia.org/wiki/Geography_of_Pennsylvania

    The Delaware, Susquehanna, Monongahela, Allegheny, and Ohio rivers are the state's major rivers. The Lehigh River in the state's east and Oil Creek in its west are smaller waterways that played vital roles in Pennsylvania's early industrial development. Pennsylvania is one of 13 original colonies that share a border with Canada.

  9. 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.