The central Mississippi River valley showing the location of the ca. 1800 Mississippi River and swamps.

J.S. Oliver (Illinois State Museum-RCC, GIS Laboratory), & G.R. Milner (Penn State Univ.). SEE ALSO Milner, G.R. 1998. The Cahokia Chiefdom: The Archaeology of a Mississippian Society. Smithsonian Institution Press, Washington.