Oklahoma's topography slopes gently downward from the high plains of the northwest to the wetlands of the southeast. The state contains four primary mountain ranges: the Ouachita Mountains in the southeast, the Arbuckle and Wichita Mountains in the south-central and southwest, and the Ozark Plateau in the northeast.
- **Highest Point:** Black Mesa, located in the far northwestern corner of the Panhandle, reaching 4,973 feet (1,516 m) above sea level. - **Lowest Point:** The Little River at its southeastern border with Arkansas, sitting at just 289 feet (88 m) above sea level. - **Distinct Features:** The state features unique geological landmarks such as the Great Salt Plains, the gypsum-capped Gloss (or Glass) Mountains, and the striking ancient granite outcroppings of the Wichita Mountains.