Coteau du Missouri (KO-to doo), plateau, central N.Dak. and N central S.Dak.; E of Missouri R. and W of James R.; 46°00'N 99°00'W. Elev. 2,000 ft/610 m. Grain and livestock region. Deposits of lignite, sodium sulphate, and bentonite here. Small midsized kettle lakes scattered sparsely throughout plateau.