Megalopolises are very big cities that have grown so much that they have joined together with other big cities nearby.
Megalopolises are often very busy and have a lot of people and buildings.
Examples:
New York and its neighboring cities form one of the biggest megalopolises in the world.
The megalopolises have a lot of traffic and tall buildings.
In megalopolises, there are many shops and restaurants.
The megalopolises are like one giant city that never ends.
The megalopolises stretch for miles and miles, with no end in sight.
I want to visit all the megalopolises in the world one day.