Bristol Urban Area

Greater Bristol is a term used for the conurbation which contains and surrounds the city of Bristol in the South West of England. There is no official "Greater Bristol" authority, but the term is sometimes used by local, regional and national authorities, and others as a synonym for either the "Bristol Urban Area" or a wider area of the former County of Avon (sometimes the whole of the former County of Avon area), and by some, TfGB (Transport for Greater Bristol), to refer to the Province of Bristol as defined by C. B. Fawcett (1919) or Derek Senior (1969). The Bristol post town covers a wider area than the city of Bristol.

One definition of "Greater Bristol" is the "Bristol Built-up Area" (previously termed the "Bristol Urban Area"), as defined by the UK Office for National Statistics (ONS). This covers the contiguous built-up area around Bristol, including the Kingswood, Mangotsfield, Stoke Gifford, Bradley Stoke, Patchway, Filton, Almondsbury, Frampton Cotterell and Winterbourne areas within South Gloucestershire; Easton-in-Gordano within North Somerset; and part of Whitchurch which falls within the administrative area of Bath and North East Somerset. However, this ONS definition does not include the city of Bath, or the towns of Yate, Keynsham, Portishead or Clevedon.

...
Wikipedia