Leeds is the largest city in the county of West Yorkshire, England. It has an economy with large tourism, financial and commercial sectors. The river Aire flows through the city.
Leeds was a small manorial borough in the 13th century, becoming a major centre for the production and trading of wool in the 17th and 18th centuries, then a major mill town during the Industrial Revolution; wool was still the dominant industry, but flax, engineering, iron foundries, printing, and other industries were also important. From being a market town in the valley of the River Aire in the 16th century, Leeds expanded and absorbed the surrounding villages to become a populous urban centre by the mid-20th century.
Leeds is the largest subdivision of the West Yorkshire Built-up Area and the Yorkshire and Humber region's most populous. West Yorkshire BUA is the UK's fourth-most populous urban area with a reported population of 1.8 million in 2013. The district borough governed from the city had a population of 793,139, the 2nd most populous district in England.