Mississippi | Capital, Population, Map, History, & Facts - Britannica

Relief and soils

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In the northwestern part of the state, the great fertile crescent called the Delta is the old floodplain of the Yazoo and Mississippi rivers, comprising some 6,250 square miles (16,200 square km) of black alluvial soil several feet deep. Once subject to disastrous floods, the land is now protected by levee and reservoir systems.

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On the eastern rim of the Delta are the loess bluffs, marking the beginning of the highlands. On the Delta’s western rim a highly fertile band of lowlands parallels the Mississippi River from Vicksburg, south to the Louisiana border. A brown loam belt of varying width extends from Tennessee to Louisiana. Most of southern Mississippi lies in the gently rolling Piney Woods. The coastal area, sometimes called the Coastal Meadows, or Terrace, borders the Gulf of Mexico. This region’s soil is sandy and not well suited to crops.

Along the northern edge of the Piney Woods lies the narrow Central Prairie, separated from the Black Prairie by a section of hills and woods. The two prairies, with fertile black soil that is excellent for many types of agriculture, were once the site of large cotton plantations. East of the Black Prairie, in the extreme northeast, are the Tennessee Hills. Arching between Tennessee and Alabama, these hills form the only area in Mississippi in which the terrain is reminiscent of the mountains of the southeastern United States.

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West of the Black Prairie another highland area, the Pontotoc Ridge, extends south from the Tennessee border. This ridge, averaging 400 to 600 feet (120 to 180 meters) above sea level, is one of the state’s most distinctive features. Its fertile sandy loam is excellent for orchards. A low-lying narrow region called Flatwoods skirts the western edges of the Pontotoc Ridge and the Black Prairie. Its heavy clay soils drain poorly, and the area has never developed a prosperous economy. The North Central Hills range through northern and central Mississippi and eastward to Alabama. Their red clay soil supports small farms. Before scientific farming methods were widely adopted, erosion depleted vast tracts of land in these hills.