"The boundary stones are the oldest federal monuments. The Residence Act of July 16, 1790, as amended March 3, 1791, authorized President George Washington to select a 100-square-mile site for the national capital on the Potomac River between Alexandria, Virginia, and Williamsport, Maryland. President Washington selected the southernmost location within these limits, so that the capital would include all of present-day Old Town Alexandria, then one of the four busiest ports in the country. Acting on instructions from Secretary of State Thomas Jefferson, Major Andrew Ellicott began surveying the ten-mile square on February 12, 1791. In 1915 the District of Columbia Chapters adopted the Boundary Stones, acquired deeds from the property owners to install a footing for the iron protective fences." (Wording from www.boundarystones.org) They had identical fences designed and installed and finally in 1916/1917 dedication ceremonies took place to mark each stone with a plaque with the name of the Chapter who agreed to be its steward.
Formerly located along Southern Avenue a few feet southeast of the intersection with Naylor Road (and not at the intersection of Naylor Road and Suitland Parkway as some sources state.) Nothing remains to mark this stone--not even a plaque. The stone is not lost however David R. Doyle of Silver Spring, MD has had it (only a stump remains) in his garage since 1991. Mr. Doyle explains, "SE4 is in my possession." The stone was recovered some years ago by volunteers from the Maryland Society of Surveyors (MSS) working on a re-survey of the DC line. As an employee of the National Geodetic Survey, a member of MSS, and the District of Columbia Association of Land Surveyors and the geodetic survey liaison for the City of Washington it was felt that it was in the best position to ultimately coordinate having this mark re-set on-line as close as its original location as possible.