Historic, Gardens And Parks, Urban Environment, Archaeology, Cultural, Interesting Places, Natural, Nature Reserves, Other Archaeological Sites, National Parks
The Cahokia Mounds State Historic Site (11 MS 2) is the site of a pre-Columbian Native American city (circa 1050–1350 CE) directly across the Mississippi River from modern St. Louis, Missouri. This historic park lies in southern Illinois between East St. Louis and Collinsville. The park covers 2,200 acres (890 ha), or about 3.5 square miles (9 km2), and contains about 80 mounds, but the ancient city was much larger. In its heyday, Cahokia covered about 6 square miles (16 km2) and included about 120 manmade earthen mounds in a wide range of sizes, shapes, and functions.