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
Big River Telephone add full-featured residential and business telephony services to their existing customer base quickly and efficiently. Big River Telephone provides back-office platform support, network connectivity for voice traffic, support for operations and marketing and technical support. Currently Big River Telephone is providing back-office support and service to cable operations in Missouri, Illinois, Kentucky, Tennessee, Mississippi, Minnesota, Arkansas, Pennsylvania, Kansas, Texas, New Jersey, New Mexico, Oklahoma, Louisiana, Colorado, Nebraska, Indiana, and Georgia. Big River Telephone Company operates a network of class 4 and class 5 switches. To ensure reliability and security, Big River has implemented Class 5 VoIP switching technologies by MetaSwitch.