Oklahoma has four primary mountain ranges: the Ouachita Mountains, the Arbuckle Mountains, the Wichita Mountains, and the Ozark Mountains. Contained within the U.S. Interior Highlands region, the Ozark and Ouachita Mountains mark the only major mountainous region between the Rocky Mountains and the Appalachians. A portion of the Flint Hills stretches into north-central Oklahoma, and near the state's eastern border, Cavanal Hill is regarded by the Oklahoma Tourism & Recreation Department as the world's tallest hill; at 1,999 feet (609 m), it fails their definition of a mountain by one foot. COUNT 5
QSN1 How many major mountain ranges are in Oklahoma? ANS1 four QSN2 Which of Oklahoma's mountain ranges are in the US Interior Highlands? ANS2 the Ozark and Ouachita Mountains QSN3 What part of Oklahoma does the Flint Hills reach into? ANS3 north-central QSN4 What is the world's tallest hill? ANS4 Cavanal Hill QSN5 How high is Cavanal Hill? ANS5 1,999 feet