Aztalan is a large Woodland and Mississippian site located on the west bank of the Crawfish River in Wisconsin.
The site was occupied between about AD 800 and 1250. It was founded during the Late Woodland period and later colonized by immigrants from the Mississippian center of Cahokia who constructed massive earthwork mounds for religious and political purposes, built fortifications and transformed the site into a miniature version of Cahokia.
They were part of a widespread culture with important settlements throughout the Mississippi River valley and its tributaries. Their trading network extended from the Great Lakes to the Gulf Coast, and into the southeast of the present-day United States.
The name Aztalan comes from the mistaken idea that the site may have been the northern place of origin of the Aztecs of Mexico whose legends and traditions mention a legendary homeland named Aztlan.