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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. Delmarva Peninsula - Wikipedia

    en.wikipedia.org/wiki/Delmarva_Peninsula

    Delmar, Maryland, part of the Salisbury Urbanized Area, lies across the Maryland-Delaware border from its twin, Delmar, Delaware, on the Transpeninsular Line. Dover, Delaware, is the Delaware state capital and the peninsula's largest city in terms of population. It is also the county seat of Kent County, DE and is home to Delaware State University.

  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. East Coast of the United States - Wikipedia

    en.wikipedia.org/wiki/East_Coast_of_the_United...

    The place name East Coast derives from the idea that the contiguous 48 states are defined by two major coastlines, one at the western edge and one on the eastern edge. Other terms for referring to this area include the Eastern Seaboard, which is another term for coastline, [3] Atlantic Coast, and Atlantic Seaboard because the coastline lies along the Atlantic Ocean.

  8. Delaware - Wikipedia

    en.wikipedia.org/wiki/Delaware

    Residents of Sussex County will also use Wicomico Regional Airport (SBY), as it is located less than 10 miles (16 km) from the Delaware border. Atlantic City International Airport (ACY), Newark Liberty International Airport (EWR), and Ronald Reagan Washington National Airport (DCA) are also within a 100-mile (160 km) radius of New Castle County.

  9. Delaware Wedge - Wikipedia

    en.wikipedia.org/wiki/Delaware_wedge

    Delaware ignored the claim. In 1892, W.C. Hodgkins of the Office of the U.S. Coast and Geodetic Survey monumented an eastward extension of the Maryland–Pennsylvania border, and created the "Top of The Wedge Line". In 1921 both states settled on this boundary, giving ownership of the Wedge – in full – to Delaware.