Tennessee is a U.S. state located in the Southeastern United States. Tennessee is bordered by Kentucky and Virginia to the north, North Carolina to the east, Georgia, Alabama, and Mississippi to the south, and Arkansas and Missouri to the west. The Appalachian Mountains dominate the eastern part of the state, and the Mississippi River forms the state's western border.
Tennessee borders eight other states: Kentucky and Virginia to the north; North Carolina to the east; Georgia, Alabama, and Mississippi on the south; Arkansas and Missouri on the Mississippi River to the west. Tennessee ties Missouri as the state bordering the most other states. The state is trisected by the Tennessee River.
The highest point in the state is Clingmans Dome at 6,643 feet (2,025 m). Clingmans Dome, which lies on Tennessee's eastern border, is the highest point on the Appalachian Trail, and is the third highest peak in the United States east of the Mississippi River. The state line between Tennessee and North Carolina crosses the summit. The state's lowest point is the Mississippi River at the Mississippi state line (the lowest point in Memphis, nearby, is at 195 ft (59 m)). The geographical center of the state is located in Murfreesboro.
The state of Tennessee is geographically, culturally, economically, and legally divided into three Grand Divisions: East Tennessee, Middle Tennessee, and West Tennessee. The state constitution allows no more than two justices of the five-member Tennessee Supreme Court to be from one Grand Division and a similar rule applies to certain commissions and boards.
Tennessee features six principal physiographic regions: the Blue Ridge, the Appalachian Ridge and Valley Region, the Cumberland Plateau, the Highland Rim, the Nashville Basin, and the Gulf Coastal Plain. Tennessee is home to the most caves in the United States, with over 9,600 documented caves to date.
East Tennessee
The Blue Ridge area lies on the eastern edge of Tennessee, bordering North Carolina. This region of Tennessee is characterized by the high mountains and rugged terrain of the western Blue Ridge Mountains, which are subdivided into several subranges, namely the Great Smoky Mountains, the Bald Mountains, the Unicoi Mountains, the Unaka Mountains and Roan Highlands, and the Iron Mountains.
The average elevation of the Blue Ridge area is 5,000 feet (1,500 m) above sea level. Clingmans Dome, the state's highest point, is located in this region. The Blue Ridge area was never more than sparsely populated, and today much of it is protected by the Cherokee National Forest, the Great Smoky Mountains National Park, and several federal wilderness areas and state parks.
Stretching west from the Blue Ridge for approximately 55 miles (89 km) is the Ridge and Valley region, in which numerous tributaries join to form the Tennessee River in the Tennessee Valley. This area of Tennessee is covered by fertile valleys separated by wooded ridges, such as Bays Mountain and Clinch Mountain. The western section of the Tennessee valley, where the depressions become broader and the ridges become lower, is called the Great Valley. In this valley are numerous towns and two of the region's three urban areas, Knoxville, the 3rd largest city in the state, and Chattanooga, the 4th largest city in the state.
The Cumberland Plateau rises to the west of the Tennessee Valley; this area is covered with flat-topped mountains separated by sharp valleys. The elevation of the Cumberland Plateau ranges from 1,500 to over 2,000 feet (450 to over 600 m) above sea level.
Middle Tennessee
West of the Cumberland Plateau is the Highland Rim, an elevated plain that surrounds the Nashville Basin. The northern section of the Highland Rim, known for its high tobacco production, is sometimes called the Pennyroyal Plateau; it is located primarily in Southwestern Kentucky. The Nashville Basin is characterized by rich, fertile farm country and great diversity of natural wildlife.
Middle Tennessee was a common destination of settlers' crossing the Appalachians from Virginia in the late 18th century and early 19th century. An important trading route called the Natchez Trace, created and used for many generations by American Indians, connected Middle Tennessee to the lower Mississippi River town of Natchez. The route of the Natchez Trace was used as the basis for a scenic highway called the Natchez Trace Parkway.
Some of the last remaining large American Chestnut trees grow in this region. They are being used to help breed blight-resistant trees.
Middle Tennessee is one of the primary state population and transportation centers along with the heart of state government. Nashville (the capital), Clarksville, and Murfreesboro are its largest cities. Fifty percent of the US population is within 600 miles (970 km) of Nashville. Interstates I-24, I-40, and I-65 trisect the Division.
West Tennessee
West of the Highland Rim and Nashville Basin is the Gulf Coastal Plain, which includes the Mississippi embayment. The Gulf Coastal Plain is, in terms of area, the predominant land region in Tennessee. It is part of the large geographic land area that begins at the Gulf of Mexico and extends north into southern Illinois. In Tennessee, the Gulf Coastal Plain is divided into three sections that extend from the Tennessee River in the east to the Mississippi River in the west.
The easternmost section, about 10 miles (16 km) in width, consists of hilly land that runs along the western bank of the Tennessee River. To the west of this narrow strip of land is a wide area of rolling hills and streams that stretches all the way to the Mississippi River; this area is called the Tennessee Bottoms or bottom land. In Memphis, the Tennessee Bottoms end in steep bluffs overlooking the river. To the west of the Tennessee Bottoms is the Mississippi Alluvial Plain, less than 300 feet (90 m) above sea level. This area of lowlands, flood plains, and swamp land is sometimes referred to as the Delta region. Memphis is the economic center of West Tennessee and the largest city in the state.
Most of West Tennessee remained Indian land until the Chickasaw Cession of 1818, when the Chickasaw ceded their land between the Tennessee River and the Mississippi River. The portion of the Chickasaw Cession that lies in Kentucky is known today as the Jackson Purchase.