Clwyd was a historic administrative county of north-east Wales, created under the Local Government Act 1972 and coming into effect in 1974, formed by merging the ancient counties of Flintshire and Denbighshire together with a small detached portion of Merionethshire, and named after the River Clwyd that runs through the fertile vale at its heart. Mold served as the county town of this new administrative unit, which lasted until 1996, when Welsh local government was reorganised again into the present pattern of unitary authorities, Clwyd's territory being divided between the new councils of Flintshire, Denbighshire, Conwy and Wrexham.
Though short-lived as a formal administrative entity, Clwyd's twenty-two years brought together a landscape of genuine variety: the industrial and mining heritage of Wrexham and the Dee estuary towns in the east, closely tied economically to nearby Chester and Merseyside, and the more rural, Welsh-speaking hill country and the celebrated Vale of Clwyd itself running north from Ruthin toward the coast at Rhyl. The county's coastal resorts, Rhyl, Prestatyn and Colwyn Bay among them, had developed since the Victorian era as popular holiday destinations for visitors from north-west England, a trade that shaped much of the local economy along this stretch of coast.
Denbigh and Ruthin castles, along with the substantial monastic ruins at Valle Crucis Abbey near Llangollen, gave Clwyd a rich inheritance of medieval Welsh and Marcher history drawn from its constituent ancient counties. Though the name Clwyd no longer denotes a local authority, it survives in regional usage and in the continuing identity of the Vale of Clwyd itself, a reminder of how administrative boundaries can rise and fall while the older geography they were drawn around endures.