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The Midlands is the central part of England, bordered by Wales, Northern England, Southern England and the North Sea. The Midlands correspond broadly to the early-medieval kingdom of Mercia, and later became important in the Industrial Revolution of the 18th and 19th centuries. They are now split into two official regions, the West Midlands and East Midlands. The Midlands' biggest city, Birmingham, is the second-largest in the United Kingdom. Other important cities include Coventry, Derby, Leicester, Lincoln, Nottingham, Stoke-on-Trent, Wolverhampton, and Worcester.