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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. Delaware County, Pennsylvania - Wikipedia

    en.wikipedia.org/wiki/Delaware_County,_Pennsylvania

    Delaware County borders Philadelphia, the nation's sixth-most populous city, to its northeast. It also is adjacent to the city-county of Philadelphia County and is included in the Philadelphia–Camden–Wilmington, PA–NJ–DE–MD metropolitan statistical area. Its county seat is Media. [4]

  4. Beaver Valley, Delaware and Pennsylvania - Wikipedia

    en.wikipedia.org/wiki/Beaver_Valley,_Delaware...

    Beaver Valley (formerly known as Chandler's Hollow) straddles the Pennsylvania and Delaware border in Delaware County, PA and New Castle County, DE. An unincorporated place name, it is traversed by several streams which drain to Beaver Run which itself empties into the Brandywine River. It is approximately bounded by US Route 202 to the east ...

  5. 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 ]

  6. 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).

  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. 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.

  9. Concord Township, Delaware County, Pennsylvania - Wikipedia

    en.wikipedia.org/wiki/Concord_Township,_Delaware...

    Concord Township is located in southwestern Delaware County and is bordered by Chadds Ford Township to the west, Thornbury Township to the north, Chester Heights to the east and Bethel Township to the southeast. A portion of the southern border of the township sits along the border-arc between Pennsylvania and Delaware known as the 12-mile circle.