Eastern Kentucky Coalfield
The Eastern Kentucky Coalfield is part of the Central Appalachian bituminous coalfield, including all or parts of 30 Kentucky counties and adjoining areas in Ohio, West Virginia, Virginia, and Tennessee. It covers an area from the Allegheny Mountains in the east across the Cumberland Plateau to the Pottsville Escarpment in the west.
Source: Wikipedia — Eastern Kentucky Coalfield (CC BY-SA 4.0)