Original: However, it is generally considered to include the counties of Derbyshire, Gloucestershire, Herefordshire, Leicestershire, Lincolnshire, Northamptonshire, Nottinghamshire, Rutland, Shropshire, Staffordshire, Warwickshire, the West Midlands and Worcestershire.
Simplified: The area lies between Southern England, Northern England, East Anglia and Wales, and  includes the counties of Derbyshire, Herefordshire, Leicestershire, Lincolnshire, Northamptonshire, Nottinghamshire, Rutland, Shropshire, Staffordshire, Warwickshire, the West Midlands and Worcestershire.