What is the top 10 biggest city in the world?

 The two main ways to define "biggest city" are by population or by area. Here are the top 10 for each:

By Population (as of 2024):

1. Tokyo, Japan (37.4 million)
2. Delhi, India (33.8 million)
3. Shanghai, China (29.9 million)
4. Dhaka, Bangladesh (23.9 million)
5. São Paulo, Brazil (22.8 million)
6. Cairo, Egypt (22.6 million)
7. Mexico City, Mexico (22.5 million)
8. Beijing, China (22.2 million)
9. Mumbai, India (21.7 million)
10. Osaka, Japan (18.9 million)

By Area:

1. Tokyo, Japan (13,572 km²)
2. Delhi, India (14,832 km²)
3. Shanghai, China (6,340 km²)
4. São Paulo, Brazil (1,521 km²)
5. Beijing, China (16,410 km²)
6. Cairo, Egypt (3,085 km²)
7. Chongqing, China (82,400 km²)
8. Buenos Aires, Argentina (7,800 km²)
9. Melbourne, Australia (8,800 km²)
10. Sydney, Australia (12,367 km²)

Please note:

• Data may vary depending on the source.
• The definition of "city" can vary by country or region.
• The "biggest city" by area, Chongqing, China, has a massive administrative area that includes rural areas.