<P> The Western Highland Rim is encountered a few miles west of Nashville and extends to the western valley of the Tennessee River . The area is a hilly area that is bisected by the Tennessee River and the Cumberland River valleys . Underlying bedrock of the region is chiefly Mississippian limestone, chert, shale, and sandstone with exposures of Devonian, Silurian, Ordovician, and Cambrian limestone, chert, and shale . In the northern part of the Western Highland Rim, sinkholes readily occur in an area with a southern extension of the Pennyroyal plateau of Kentucky, where the karst is best developed on the Mississippian St. Louis Limestone and the Ste . Genevieve Limestone . </P> <P> The Eastern Rim rises approximately fifty miles east of Nashville and is bordered to its east by even higher terrain, the Cumberland Plateau . Erosion has exposed carbonate bedrock of Late Paleozoic age . These carbonate rocks contain variable amounts of chert and are often interbedded with fine grained clastic rocks . As a result, these rocks are more resistant to erosion than the underlying purer limestones of the Lower (Early) Paleozoic . The geology is diverse and is typically limestone at valley floors (around 500 feet (150 m) elevation) and sandstone on ridges (to around 1,000 feet). The constituent bedrock is composed primarily of Mississippian aged St. Louis, and Warsaw limestones with Fort Payne chert underlain by Chattanooga Shale that forms a large part of the escarpment . This area is mostly undulating plains, hills, and karst . </P> <P> The Northern Highland Rim is encountered a few miles north of Nashville and extends to the Kentucky border, and the region of Kentucky adjacent to it called the Pennyroyal is in fact largely a continuation of it under another name . </P> <P> For the most part the Southern Rim is the farthest from Nashville, rising at some points just a few miles north of the border with Alabama . The landforms are continuous with those in adjacent portions of Alabama, although perhaps the most spectacular landforms of any portion of the Rim are to be found there . </P>

Where is the northern highland rim in tennessee