The state has four primary mountain ranges: the Ouachita Mountains, the Arbuckle Mountains, the Wichita Mountains, and the Ozark Mountains.[18] The U.S. Interior Highlands Region, which contains the Ozark and Ouachita Mountains, is the only major mountainous region between the Rocky Mountains and the Appalachians. A portion of the Flint Hills stretches into north-central Oklahoma, and in the state's southeastern corner, Cavanal Hill is officially regarded as the world's tallest hill; at 1,999 feet, it fails the definition of a mountain by one foot. More than 500 named creeks and rivers make up Oklahoma's waterways.
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