London is that the capital and largest city of England and thus the united kingdom . the town stands on the Thames within the south-east of England, at the highest of its 50-mile estuary leading to the North Sea, London has been a significant settlement for two millennia. Londinium was founded by the Romans. the town of London, London's ancient core and financial centre an area of just 1.12 square miles and colloquially mentioned because the square measure retains boundaries that closely follow its medieval limits. The adjacent City of Westminster is an Inner London borough and has for many years been things of much of the national government. Thirty one additional boroughs north and south of the river also comprise modern London. London is governed by the mayor of London and thus the London Assembly.

London is taken under consideration to be one of the world's most significant global cities and has been called the world's most powerful, most desirable, most influentia, most visited, costliest, sustainable, most investment-friendly and most-popular-for-work city. It exerts a considerable impact upon the humanities, commerce, education, entertainment, fashion, finance, healthcare, media, professional services, research and development, tourism and transportation. London ranks 26^th out of 300 major cities for economic performance.It is one of the foremost important financial centres and has either the fifth or the sixth-largest metropolitan area GDP. it is the most-visited city as measured by international arrivals and has the busiest city airport system as measured by passenger traffic. It is the leading investment destination, hosting more international retailers than the opposite city. As of 2020, London has the second-highest number of billionaires of any city in Europe, after Moscow. In 2019, London had the absolute best number of ultra high-net-worth individuals in Europe. London's universities form the foremost important concentration of upper education institutes in Europe, and London is home to highly ranked institutions like Imperial College London in natural and applied sciences, and thus the London School of Economics in social sciences. In 2012, London became the first city to possess hosted three modern Summer Olympic Games.