Unlike in the rest of the state, bedrock is buried a few thousand feet below the surface. The soil in this part of the state comes from when a prehistoric sea dried up and left sediment in its place. Otherwise, most of the land in West Tennessee is used as farmland. Although the land is lower and flatter than Middle and East Tennessee, some hilly terrain exists, especially along the bluffs bordering the Mississippi River and the land bordering the Tennessee River, known as the West Tennessee Highlands. However, much of the western counties of the region are protected from flooding by the Chickasaw Bluffs, ridges of loess rising 50 to 200 feet (15 to 61 m) above the floodplain. Areas along the Mississippi River are located within the Mississippi Alluvial Plain, which is primarily a floodplain with many swamps. Because of this, the terrain is flatter than the eastern parts of the state. West Tennessee is located almost entirely within the Mississippi Embayment, part of the Gulf Coastal Plain.
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