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right Kentucky River in the Bluegrass region. The Bluegrass region is a region of the United States. The Bluegrass region, centered around Lexington, is generally considered to include central and northern Kentucky with a small area extending into southern Ohio. The region gets its name from Bluegrass, the common name for grass of the genus Poa, which is a favored lawn and pasture grass in the eastern United States from Tennessee northward.

The Bluegrass region is characterized by underlying fossiliferous limestone, dolostone, and shaleShale is a fine-grained sedimentary rock whose original constituents were clays or muds. It is characterized by thin laminae breaking with an irregular curving fracture, often splintery, and parallel to the often indistinguishable bedding planes. Non-fiss of the OrdovicianThe Ordovician period is the second of the six (seven in North America) periods of the Paleozoic era. The Ordovician follows the Cambrian period and is followed by the Silurian period. The Ordovician named after the Welsh tribe of the Ordovices was define geologicalGeology (from Greek γ&eta ge "the earth") and λογος logos "word", "reason")) is the science and study of the Earth, its composition, structure, physical properties, history, and the processes that shape it. Geolog age. Hills are generally rolling, and the soilSoil is the layer of minerals and organic matter, in thickness from centimetres to a metre or more, on the land surface. Its main components are mineral matter, organic matter, moisture, and air. Soils differ in the ratio of these components. Modern soil is highly fertile for growing pasture. Because of this, the Bluegrass is well known for its horseThis article discusses ungulate mammals. For other meanings of horse see Horse (disambiguation). The Horse Equus caballus is a large ungulate mammal, one of the seven modern species of the genus Equus''. It has long played an important role in transportat farms. However, the area is becoming more developed, particularly around Lexington, and farms are disappearing to development.

The Kentucky Bluegrass is bounded on the east by the Cumberland PlateauThe Cumberland Plateau includes much of eastern Kentucky, USA and western West Virginia. It also stretches in a band across Tennessee to include a small portion of northern Alabama. It is a deeply dissected plateau, with topographic relief commonly of abo, with the Pottsville Escarpment forming the boundary. On the south and west, it borders the Pennyroyal Plateau, (also called the Pennyrile), with Muldraugh Hill, another escarpment, forming the boundary. Much of the region is drained by the Kentucky River and its tributaries. The river cuts a deep canyon through the region, preserving meanders that indicate that the river was once a mature low valley that was suddenly uplifted. Particularly near the Kentucky River, the region exhibits karst topography, with sinkholes, caves, and disappearing streams which drain underground to the river.

The area gave its name to Bluegrass music, which is popular throughout Appalachia and the South.