Cities That Are Bigger Than Countries

The Greater Tokyo Area is the largest metropolitan area in the world by almost any measure. It encompasses Tokyo proper plus the surrounding prefectures of Kanagawa, Saitama, and Chiba. The result: a contiguous urban zone containing 37 million people. And yet, paradoxically, one of the most orderly, safe, clean, and functional urban environments ever assembled. Tokyo's trains run on time to the second. Its streets are safe at 3am. Its restaurants make people fly across the Pacific. The fact that 37 million people share this space with minimal chaos is one of the great organizational achievements of human civilization. I'm not exaggerating.

The National Capital Territory of Delhi, spanning New Delhi and its surrounding urban agglomeration, is growing at a pace that may make it the world's largest city within the next decade. UN projections suggest Delhi could surpass Tokyo in population by around 2028. It is already one of the most complex human settlements ever assembled: ancient history layered under Mughal architecture layered under British colonial planning layered under explosive 21st-century growth. It's chaotic, vibrant, congested, fascinating, and home to more people than the entire continent of Australia.

São Paulo is South America's economic engine, a city of 22 million that generates roughly 11% of Brazil's entire GDP. It's one of the most ethnically diverse cities in the world, home to the largest Japanese diaspora outside Japan, large Italian and German communities, and millions from across Brazil. Its financial district rivals any in the world. Its cultural output in music, art, theater, and food shapes the entire continent. It is bigger, by a substantial margin, than 90% of the world's countries. São Paulo gets a lot less attention than it deserves.

Cairo is the largest city in Africa and the Arab world. For over five thousand years, since before the pharaohs, the Nile Delta has supported one of the densest concentrations of humanity on Earth. Today's Cairo sprawls across both banks of the Nile, streets perpetually full of life, traffic, commerce, and the sounds of a city that has never really slept. The pyramids of Giza, built when the entire world's population was probably under 50 million, now look out over a city of 21 million. That juxtaposition stops me cold every time I think about it.

Built on an ancient lakebed at 2,240 meters above sea level on the site of the Aztec capital Tenochtitlan, Mexico City is one of the oldest continuously inhabited cities in the Americas. It's home to more people than the Netherlands, Belgium, and Portugal combined. North America's largest Spanish-speaking city and one of the great cultural capitals of the world. Also: the city literally sinks up to 50 centimeters (about 20 inches) per year in some areas under its own weight. That's both a serious engineering problem and kind of a perfect metaphor for the improbable density of human life piled up on an ancient lake.