Burnley is a large market town in the borough of Burnley in Lancashire, England. It lies 11 miles (18 km) east of Blackburn and 25 miles (40 km) east of Preston, at the confluence of the River Calder and River Brun. It began life in the early medieval period as a small market town, but its main period of expansion came during the Industrial Revolution, when it became one of the world's largest producers of cotton cloth. Today, Burnley has lost much of its industry, and is increasingly a dormitory town for Manchester, Leeds and the M65 corridor.