What are the top 10 largest cities?

- Tokyo, Japan - 38 million

- Delhi, India - 29 million

- Shanghai, China - 26 million

- Beijing, China - 21 million

- Guangzhou, China - 19 million

- Shenzhen, China - 17 million

- Chongqing, China - 16 million

- Istanbul, Turkey - 15 million

- Karachi, Pakistan - 15 million

- Dhaka, Bangladesh - 14 million