Which city is the largest by metro population?

Tokyo is commonly ranked as the largest metropolitan area in the world, with a population of around 37 million in its broader urban agglomeration. The exact figure depends on how the metro area is defined, but Tokyo consistently ranks near the top globally. It is Japan’s capital and a major center for finance, technology, culture, and transportation. The greater Tokyo area includes many densely connected cities and suburbs, making it one of the world’s most complex urban regions. Its scale has made it a model case for megacity planning.