The Tennessee River winds its way for roughly 650 miles through Tennessee, Alabama, Mississippi, and back into Tennessee, before reaching Kentucky where it empties into the Ohio River. In total the Basin encompasses over 40,000 square miles, covering five major physiographic provinces: the Blue Ridge, the Valley and Ridge, the Appalachian Plateau, the Interior Low Plateaus, and the Coastal Plain. The extent of the Basin’s reach vast diversity of geography and geology in the region help to explain why the area harbors one of the most biologically diverse freshwater ecosystems in the world.
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