Kentucky, officiaIIy the Commonwealth of Kentucky, is a state located in the east south-central region of the United States. Kentucky is one of four U.S. states constituted as a commonwealth (the others being Virginia, Pennsylvania, and Massachusetts). Originally a part of Virginia, in 1792 Kentucky became the 15th state to join the Union. Kentucky is the 37th most extensive and the 26th most populous of the 50 United States.

Kentucky is known as the "Bluegrass State", a nickname based on the bluegrass found in many of its pastures because of the fertile soil. One of the major regions in Kentucky is the Bluegrass Region in central Kentucky which houses two of its major cities, Louisville and Lexington. It is a land with diverse environments and abundant resources, including the world's longest cave system, Mammoth Cave National Park, the greatest length of navigable waterways and streams in the contiguous United States, and the two largest man-made lakes east of the Mississippi River.

Kentucky is also home to the highest per capita number of deer and turkey in the United States, the largest free-ranging elk herd east of the Mississippi River, and the nation's most productive coalfield. Kentucky is also known for horse racing, bourbon distilleries, automobile manufacturing, tobacco, bluegrass music, college basketball, and Kentucky Fried Chicken.

Geography

Kentucky is situated in the Upland South. A significant portion of eastern Kentucky is part of Appalachia.

Kentucky borders seven states, from the Midwest and the Southeast. West Virginia lies to the east, Virginia to the southeast, Tennessee to the south, Missouri to the west, Illinois and Indiana to the northwest, and Ohio to the north and northeast. Only Missouri and Tennessee, both of which border eight states, touch more states.

Kentucky's northern border is formed by the Ohio River and its western border by the Mississippi River. The official state borders are based on the courses of the rivers as they existed when Kentucky became a state in 1792. In several places, the rivers have changed courses away from the original borders. For instance, northbound travelers on US 41 from Henderson, after crossing the Ohio River, will be in Kentucky for about two miles. Ellis Park, a thoroughbred racetrack, is located in this small piece of Kentucky. Waterworks Road is part of the only land border between Indiana and Kentucky.

Kentucky is the only U.S. state to have a non-contiguous part existing as an exclave surrounded by other states. Fulton County, in the far west corner of the state, includes Kentucky Bend. This small part of Kentucky on the Mississippi River is only accessible by road via Tennessee. The epicenter of the powerful 1811-1812 New Madrid Earthquakes was near here, even causing the river to flow backwards in some areas. Though the series of quakes did change the area geologically and affect the (small number of) inhabitants of the area at the time, the Kentucky Bend was formed because of a surveying error, not the New Madrid Earthquake.