London is England's and the United Kingdom's capital and largest city. The city is located on the Thames River in the south-east of England, at the head of a 50-mile estuary that leads to the North Sea. London is one of the most foremost global cities in the world. It has a significant impact on the arts, commerce, education, entertainment, fashion, finance, healthcare, media, professional services, R&D, tourism, and transportation. It is one of the world's largest financial centres, and in 2019, London had the second highest number of ultra-high-net-worth individuals in Europe, trailing only Paris.  In 2020, London had the second-highest number of billionaires in Europe, trailing only Moscow.  London has the highest concentration of higher education institutes in Europe. In 2012, London became the first city to host three modern-day Summer Olympic Games. London is home to a diverse range of people and cultures, and the region is home to more than 300 languages. With 14,040,163 inhabitants in 2016, the London metropolitan area is Europe's third-most populous after Istanbul and the Moscow Metropolitan Area.