The Density Illusion: How I Discovered Manila is the World's Most Crowded City I recently returned from a trip to Metro Manila, and I have a confession to make: I had no idea I had just visited the most densely populated metropolitan area on Earth. Like most people, I assumed the world's most crowded cities would be the ones with the biggest names—Tokyo, Shanghai, Beijing, Shenzhen. These are the megacities we read about, the ones that dominate headlines about urban expansion and population booms. It seems intuitive: the world's largest metro area (Tokyo) or its most populous country (China) must surely hold the density records. I was wrong. Spectacularly wrong. The Tokyo Assumption My initial thinking was perfectly logical. The Greater Tokyo Area is home to roughly 37 to 40 million people—equivalent to the entire population of California or Canada crammed into a single urban expanse. That sounds impossibly crowded. When you hear that statistic, your mind conjur...