Greater Glasgow is an urban settlement in Scotland consisting of all localities which are physically attached to the city of Glasgow, forming with it a single contiguous urban area (or conurbation). It does not relate to municipal government boundaries and its territorial extent is defined by the General Register Office for Scotland, which determines settlements in Scotland for census and statistical purposes. Greater Glasgow had a population of 1,199,629 at the 2001 census making it the largest urban area in Scotland and the fifth largest in the United Kingdom.