What are mega cities?

A megacity is a very large city, typically with a toatl poluation of 10 million. Examples of megacities include:

• Tokyo- Japan
• Shanghai- China
• Jakarta- Indonesia 
• Delhi- India 
• Seoul- Korea 
• Beijing- China
• New York City- United States of America
• Sao Paulo- Mexico 
• Mexico City- Mexico 
• Lagos- Nigeria 
• Los Angeles- United States of America
• London- England