[custom_adv] London, city, capital of the United Kingdom. It is among the oldest of the world’s great cities—its history spanning nearly two millennia—and one of the most cosmopolitan. By far Britain’s largest metropolis, it is also the country’s economic, transportation, and cultural centre. [custom_adv] London is situated in southeastern England, lying astride the River Thames some 50 miles (80 km) upstream from its estuary on the North Sea. [custom_adv] In satellite photographs the metropolis can be seen to sit compactly in a Green Belt of open land, with its principal ring highway (the M25 motorway) threaded around it at a radius of about 20 miles (30 km) from the city centre. [custom_adv] Its physical limits more or less correspond to the administrative and statistical boundaries separating the metropolitan county of Greater London from the “home counties” of Kent, Surrey, and Berkshire (in clockwise order) to the south of the river and Buckinghamshire, Hertfordshire, and Essex to the north. [custom_adv] The historic counties of Kent, Hertfordshire, and Essex extend in area beyond the current administrative counties with the same names to include substantial parts of the metropolitan county of Greater London, which was formed in 1965. [custom_adv] Most of Greater London south of the Thames belongs to the historic county of Surrey, while most of Greater London north of the Thames belongs historically to the county of Middlesex. [custom_adv] Area Greater London, 607 square miles (1,572 square km). Pop. (2001) Greater London, 7,172,091; (2011 prelim.) Greater London, 8,173,941. [custom_adv] If the border of the metropolis is well defined, its internal structure is immensely complicated and defies description. Indeed, London’s defining characteristic is an absence of overall form. [custom_adv] It is physically a polycentric city, with many core districts and no clear hierarchy among them. The growth of the built-up area was halted by strict town planning controls in the mid-1950s.
