A megalopolis is like a really big city made up of lots of smaller cities and towns that are all squished together. Imagine you have a whole bunch of toys, like blocks and Legos, and you stack them up really tall until they make one big tower. That’s kind of what a megalopolis is like, but with cities and towns instead of toys. Some places that are considered megalopolises are places like New York and Boston in the United States or Tokyo in Japan. Because there are so many people living in such a big area, a megalopolis can be really busy and crowded, with lots of buildings, roads, and people trying to go places.