page_title: City of London
section_title: The boundary of the City
hierarchical_section_title: City of London / Governance / The boundary of the City
caption_attribution_description: English: Dragon statue atop monument at Temple Bar, London. Photograph taken by Michael Reeve, 18 April 2003.
context_page_description: The City of London is a city, ceremonial county and local government district that contains the historic centre and the primary central business district of London. It constituted most of London from its settlement by the Romans in the 1st century AD to the Middle Ages, but the modern city named London has since grown far beyond the formal City of London borders. The City is now only a tiny part of the metropolis of London, though it remains a notable part of central London. Administratively, it forms one of the 33 local authority districts of London; however, the City of London is not a London borough, a status reserved for the other 32 districts. It is also a separate ceremonial county, being an enclave surrounded by Greater London, and is the smallest county in the United Kingdom.
  The City of London is widely referred to simply as the City and is also colloquially known as the Square Mile, as it is 1.12 sq mi in area. Both of these terms are also often used as metonyms for the United Kingdom's trading and financial services industries, which continue a notable history of being largely based in the City.
context_section_description: The size of the City was constrained by a defensive perimeter wall, known as London Wall, which was built by the Romans in the late 2nd century to protect their strategic port city. However the boundaries of the City of London no longer coincide with the old city wall, as the City expanded its jurisdiction slightly over time. During the medieval era, the City's jurisdiction expanded westwards, crossing the historic western border of the original settlement—the River Fleet—along Fleet Street to Temple Bar. The City also took in the other "City bars" which were situated just beyond the old walled area, such as at Holborn, Aldersgate, West Smithfield, Bishopsgate and Aldgate. These were the important entrances to the City and their control was vital in maintaining the City's special privileges over certain trades.
  Most of the wall has disappeared, but several sections remain visible. A section near the Museum of London was revealed after the devastation of an air raid on 29 December 1940 at the height of the Blitz. Other visible sections are at St Alphage, and there are two sections near the Tower of London. The River Fleet was canalised after the Great Fire of 1666 and then in stages was bricked up and has been since the 18th century one of London's "lost rivers or streams", today underground as a storm drain.
  The boundary of the City was unchanged until minor boundary changes on 1 April 1994, when it expanded slightly to the west, north and east, taking small parcels of land from the London Boroughs of Westminster, Camden, Islington, Hackney and Tower Hamlets. The main purpose of these changes was to tidy up the boundary where it had been rendered obsolete by changes in the urban landscape. In this process the City also lost small parcels of land, though there was an overall net gain (the City grew from 1.05 to 1.12 square miles). Most notably, the changes placed the (then recently developed) Broadgate estate entirely in the City.
  Southwark, to the south of the City on the other side of the Thames, was within the City between 1550 and 1899 as the Ward of Bridge Without, a situation connected with the Guildable Manor. The City's administrative responsibility there had in practice disappeared by the mid-Victorian period as various aspects of metropolitan government were extended into the neighbouring areas. Today it is part of the London Borough of Southwark. The Tower of London has always been outside the City and comes under the London Borough of Tower Hamlets.
caption: Dragon statue on the Temple Bar monument, which marks the boundary between the City of London and City of Westminster.
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