Boundary markers of the original District of Columbia - Wikipedia
https://en.wikipedia.org/wiki/Boundary_Markers_of_the_Original_District_of_Columbia
WEBGeography Map of the boundary stones. The District of Columbia (initially, the Territory of Columbia) was originally specified to be a square 100 square miles (260 km 2) in area, with the axes between the corners of the square running north-south and east-west, The square had its southern corner at the southern tip of Jones Point in Alexandria, Virginia, at the …
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