The United Kingdom is located in Northern Europe and is composed of four countries: England, Wales, Scotland, and Northern Ireland. Its capital is London, located on the River Thames in England. London has a population of over 7.5 million people and experiences mild summers around 18°C and cold winters around 4°C, rarely exceeding 33°C in summer. The total area of the UK is around 243,610 square kilometers and it has a temperate, oceanic climate with abundant rainfall and temperatures that seldom drop below -10°C or rise above 35°C across its regions.