Boyd County, Kentucky is located in what mountain range?
Boyd County, Kentucky:  Its 160 sqmi are found at the northeastern edge of the state near the Ohio River and Big Sandy River, nestled in the verdant rolling hills of Appalachia. Appalachia:  While the Appalachian Mountains stretch from Belle Isle (Newfoundland and Labrador) in Canada to Cheaha Mountain in Alabama, the cultural region of Appalachia typically refers only to the central and southern portions of the range.
Appalachian Mountains