Maybe you knew this but I did not. Given the amount of flat land between the two ranges, I always though that the name "Illinois Ozarks" was just another name used for the Shawnee Hills because of their proximity to the Missouri Ozarks. Turns out I am wrong. The two sets of hills are part of one eroded tableland and the flat area between the two is due to the meandering and flooding of the Mississippi River. If the Mississippi did not run there, the Ozarks would run continuously from Indiana to Oklahoma
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