Six Flags St. Louis, originally Six Flags Over Mid-America, is a theme park located in Eureka, Missouri. Owned and operated by Six Flags, the park opened on June 5, 1971, as the third of the company's three original theme parks. The park was conceived by Six Flags founder Angus G. Wynne in the 1960's, and was designed by Randall Duell. Its layout consists of eight themed areas, each of which contain numerous attractions, dining locations, and live entertainment. The adjacent Hurricane Harbor water park is free with park admission.
Since its original opening in 1971, the park has undergone many changes, most notably of which are the replacement or renaming of all six of the park's original areas in the 1990's, as well as the addition of two new ones.