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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]
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 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.
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).
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.
The 49th parallel was agreed to be the border between the United States and British North America (later Canada) from Lake of the Woods to the Strait of Juan de Fuca in the Treaty of 1818 and Oregon Treaty. However, the true boundary line as surveyed deviates several seconds from the true parallel, as seen in this significantly exaggerated ...
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This also applies both to the border between Maryland and West Virginia (from Harper's Ferry to the source of the Potomac near the Fairfax Stone) since the latter was at one point part of Virginia, and to the border between Virginia and Washington, D.C., since the capital was established from a section of Maryland property.