This image shows mega regions in the world. Mega regions are defined as places with massive populations, or mega populations.
On the west, the two continental Americas are both almost completely urbanized. Although there are many concentrated groups of cities with populations of five to ten million, these two continents only have a combined total of six mega populations.
That is, on North and South America, there are only six places with populations of ten million or more.
In the east, on the other hand, things are different.
Much of Asia, Europe and Africa have dense city groups with populations of ten million or less. These cities are all clustered together and tend to lie on the coast, the closer they get to east Asia.
Australia is the continent with the least number of mega populations.