Norwich is a city on the River Wensum in England. It is the regional administrative centre and county town of Norfolk. During the 11th century, Norwich was the largest city in England after London, and one of the most important places in the kingdom. Until the Industrial Revolution, Norwich was the capital of the most populous county in England and vied with Bristol as England's second city.The urban or built-up area of Norwich had a population of 213,166 according to the 2011 Census. This area extends beyond the city boundary, with extensive suburban areas on the western, northern and eastern sides, including Costessey, Taverham, Hellesdon, Bowthorpe, Old Catton, Sprowston and Thorpe St Andrew. The parliamentary seats cross over into adjacent local government districts. 132,512 (2011 census) people live in the City of Norwich and the population of the Norwich Travel to Work Area (i.e. the self contained labour market area in and around Norwich in which most people live and commute to work) is 282,000 (mid-2009 estimate). Norwich is the fourth most densely populated local government district within the East of England with 3,480 people per square kilometre (8,993 per square mile).