Louisiana Purchase State Park, in Arkansas near Blackton, Arkansas, was declared a National Historic Landmark in 1993 under the title Beginning Point of the Louisiana Purchase Survey. It is the point from which the lands acquired through the Louisiana Purchase of 1803 were subsequently surveyed. A granite marker was dedicated in 1926. The marker is located in a swamp, but is accessible by a 950 foot boardwalk. The park encompasses 37.5 acres of swampland.
Top: Entrance to the park on Highway 362
Middle: Boardwalk leading to the marker
Bottom: The historical marker