Marker Initial point marker The original stone monument set in 1858 to commemorate the 1825 establishment of the boundary between Arkansas Territory and Indian Country. The boundary was "A line beginning on the Arkansas [River] one hundred paces east of Fort Smith and running thence, due south, to Red River." North of the Arkansas River, the boundary was fixed on a direct line from the northeast corner of Missouri. Fort Smith National Historic Site, FOSM 2835