The Cotswolds lie within the current ceremonial counties of Oxfordshire , Gloucestershire , Wiltshire , Somerset , Warwickshire , and Worcestershire . The county of Gloucestershire forms the largest area of the Cotswolds . The Cotswolds AONB , which is the largest in England and Wales , stretches from the border regions of South Warwickshire and Worcestershire , through West Oxfordshire and Gloucestershire and takes in parts of North Wiltshire , and Bath and North East Somerset in the South .