Megalopolis

A megalopolis is a really, really big city made up of lots and lots of smaller cities that have grown together. Imagine if all your friends in your neighborhood and all their friends in their neighborhoods, and all the neighborhoods for miles and miles around all became one big neighborhood. That's kind of like what a megalopolis is. It's like a super neighborhood with a whole bunch of big buildings, lots of people, and tons of traffic. Some megalopolises have millions and millions of people living in them! They're so big, you might not even be able to see one end from the other.