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The majority of Region IV streams and rivers occur within the Ridge and Valley physiographic province, bordered to the east by the Blue Ridge and to the west by the Cumberland Plateau provinces. For the most part, they are in the upper Tennessee River basin except for those draining into the Cumberland River system in parts of Anderson, Campbell, and Claiborne counties. The main channel of the Tennessee River is impounded throughout, as is the Tennessee portion of the Little Tennessee River. Likewise, most major Tennessee River tributaries in Region IV have large reservoirs on them. Only Little River and the upper portions of the Clinch and Powell rivers have escaped the direct effects of impoundments. Of all the rivers in the region, the upper Clinch remains the least altered and supports one of the most diverse fish faunas in North America. Overall, the region has great habitat diversity and supports a very diverse aquatic fauna. Region IV’s streams and larger river systems are important because they provide habitat for aquatic and terrestrial wildlife and also provide recreational opportunities for the public. Eight large river systems are significant fisheries that provide angling opportunities for smallmouth bass, rock bass, and other game fish species.