Jointly surveyed by Major Andrew Ellicott, U.S. Commissioner, and
Esteban Minor, Spanish Commissioner, to determine boundaries as agreed
in the Treaty of San
Lorenzo in 1795. The line began at the
Mississippi River, ran east along 31° North Latitude to the Chattahoochee River, and eventually to the Atlantic
The Mound Line
Mile Mound #216 located 1200 feet East
Surveyed in 1799 to mark the 31° North Latitude, this line charted the
first southern boundary of the United States, separating the U.S. from
Spanish Florida. The line was marked at one-mile intervals by earthen
mounds approximately fifteen-feet square and three-feet high with a
charred lighter-pine post at the center, hence the name Mound Line.
The plaque is located on
Highway 59 North in Stockton.
There is another Ellicott Line
north of Satsuma, Alabama on US Highway 43.