Near the Mississippi River in southern Illinois, the Cleiman Mound and Village Site preserves both an intact burial mound and the remains of a village, documenting a long span of human occupation from before 400 B.C. through A.D. 1300. Its sequence across the Archaic, Woodland, and Mississippian periods makes it an unusually valuable record of changing lifeways in the Mississippi Valley over many centuries. The site’s most significant feature is a burial mound built during the Middle Woodland period by Hopewellian peoples, thought to be the only Hopewell mound in southern Illinois’s Mississippi Valley, which gives the site special importance in regional prehistory.