The Twelve-Mile Circle boundary between Delaware and Pennsylvania is the only state boundary in the U.S. that is circular. In 1701, William Penn appointed Isaac Taylor and Thomas Piersons to survey the boundary between the counties. The circular line was marked by blazed (ax cuts) trees. Nearly two hundred years later, in the 1890s, Delaware and Pennsylvania had little clear information as to the actual location of the boundary. Commissioners from both states obtained the services of Col. W.C. Hodgkins of the U.S. Coast and Geodetic Survey to locate and mark the boundary.
Coordinates takes you to one of the granite markers placed by Col. Hodgkins. From there, project to find a small cache to memorialize your historic find. If you use one of the various geocaching apps, learn how to project a new waypoint. Project 88 feet at 24 degrees. Our app defaults to meters, so make sure to change to feet.
Coordinates are very jumpy here, so you may need to use your geosenses to find the small camouflage taped container. BYOP and a pen is best on rite in rain paper.
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