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Kentucky lies within three major physiographic regions of the United States—the Appalachian Highlands (the Appalachian Plateau), the Interior Lowlands, and the Coastal Plain. Within the state, six smaller regions may be identified, based on the underlying rock structure: Mountain, Knobs, Bluegrass, Pennyrile (or Pennyroyal), Western Coalfield, and Purchase.

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More than 10,000 square miles (26,000 square km) of the easternmost part of Kentucky lie in the Mountain region, where the state reaches its highest point, at Big Black Mountain (4,145 feet [1,263 metres]), on the border with Virginia. The deeply dissected Cumberland Plateau, which lies to the west of the Cumberland Mountains and the Pine Mountain ridge, is a scenic land of narrow valleys, steep pinnacles, and transverse ridges. Natural passages through eastern Kentucky’s mountain mazes are sometimes provided by water gaps, such as historic Cumberland Gap, and the picturesque Breaks of Sandy. The great eastern coalfields of Kentucky also lie in the Mountain region.

The Knobs is a long, narrow region shaped like an irregular horseshoe, with both ends touching the Ohio River. It embraces the Bluegrass country on its inner side, and it is bounded by the Mountain area on the east and the Pennyrile on the west. The landscape of the Knobs is dotted with cone-shaped or rounded hills that are remnants of escarpments. Thickets of cane grew on some of the lower ground before European settlement and attracted large herds of buffalo and deer. A portion of Daniel Boone National Forest lies in the eastern Knobs.

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