mountain in Iron county, southeastern Missouri, U.S., highest point (1,772 feet 【540 m】) of the St. Francois Mountains and of the state. Centrepiece of Taum Sauk Mountain State Park, it is part of the main uplift of the forested Ozark Mountains and lies 90 miles (145 km) south of St. Louis. The name of Sauk (Sac) probably refers to the Native American name meaning “outlet.”