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
Muddy River (Nevada) By 1855 it had become a cold season freight route between Utah and Southern California that remained in use in Southern Nevada into the 20th century. Mormon settlers established several settlements in the Muddy River area in 1864, including the town of St. Thomas, which by 1938 was submerged under Lake Mead until recently. Some of the towns ruins can be still seen during low water levels. Some Paiutes fought to protect and reclaim their homeland. For a variety of reasons, including the harsh climate, unpredictable periods of drought, and a tax dispute with the State of Nevada, the Mormons