The Ozarks exist in the United States.
Ozarks . Much smaller pieces of the Ozarks extend westward into northeastern Oklahoma and extreme southeastern Kansas . The Shawnee Hills of southwest Illinois , which lie near the eastern edge of this region , are commonly called the `` Illinois Ozarks , '' but are generally not considered part of the true Ozarks . Together , the Ozarks and Ouachita Mountains form an area known as the U.S. Interior Highlands , and are sometimes referred to collectively .