Answer:
Most of the world's megacities are found in Asia, as shown on the map below. They are also often found in coastal locations. Global patterns of urbanisation.
The top five megacities are all located in Asia. Asia is the continent with the most overall megacities with 19 (or 20 if you count Turkey as part of Asia). Europe has five megacities (including Istanbul, Turkey). Africa, North America, and South America each have three megacities.