In 1811, Andrew Ellicott made a survey for the state of Georgia to resolve the boundary dispute between Georgia and North Carolina, which in 1810 had resulted in a short armed conflict between the two called the Walton War. He engraved a large rock in the Chattooga River with "N-G", standing for North Carolina - Georgia. The location had been prescribed in part in 1787 by the Treaty of Beaufort, though the river was not named explicitly, but rather as a then-undiscovered tributary of the Savannah River between Georgia and South Carolina. The nominal latitude of 35°N was later specified by the U.S. Congress.