Southern Illinois the Ozarks of Missouri, is chiefly in southern Jackson, Union, northern Alexander and Johnson counties. The eastern area, more closely related to the Wabash Valley Seismic Zone, is mostly in northern Pope, southern Saline, Gallatin, eastern Johnson and southern Williamson counties. The Shawnee National Forest covers a large territory, including seven wilderness areas: Garden of the Gods, Bay Creek, Clear Springs, Bald Knob, Burden Falls, Lusk Creek, and Panthers Den. Of southern Illinois' rivers, only the Mississippi and the Ohio are navigable for modern commerce. The Big Muddy River, Marys River, Saline River and Cache River run their courses in
Fox River (Little Wabash tributary) Fox River: Fox River (Little Wabash tributary) The Fox River is a tributary of the Little Wabash River in southern Illinois. It rises in Jasper County to the southeast of Newton and flows south past Olney, then joins the Little Wabash at the northeast corner of Edwards County, near Mt. Erie. The river is in length. There is a smaller "Fox River" that is a tributary of the Wabash River in southern Illinois, entering the Wabash near New Harmony, Indiana. The following cities, towns and villages are in the Fox River watershed: The following counties are at least partially drained