Isolated, eroded mountain region in western South Dakota and northeastern Wyoming, U.S., lying largely within the Black Hills National Forest. The hills lie between the Cheyenne and Belle Fourche rivers and rise about 3,000 feet (900 m) above the surrounding plains; they culminate in Harney Peak (7,242 feet [2,207 m]), the highest point in South Dakota. The Black Hills formed as a result of an upwarping
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