Noisy, vibrant and truly multicultural, London is a megalopolis of people, ideas and energy. The capital and largest city of both the United Kingdom and of England, it is also the largest city in Western Europe and the European Union. Situated on the River Thames in South-East England, Greater London has an official population of nearly 8 million people — although the figure of over 14 million for the city's total metropolitan area more accurately reflects London's size and importance. London is one of the great "world cities," and remains a global capital of culture, fashion, finance, politics and trade.