Question

Which region has the largest number of the 10 most populous countries within its boundaries?

Answer 1

hundred years ago, in the beginning of the 20th century the entire world population was less than 2 billion people.

Today, in 2017, the current world population has exceeded 7 billions (7,299,000,000).

The world’s population is growing by 200,000 people a day!, but death and birth rates have declined over the past several decades. (World Bank)

See some Demographic Data for the Countries and Regions of the World:
Top 25 countries by population
The most populated countries in the world.

Population Density
Countries with the highest population density.

Answer 2

Asia

Step-by-step explanation:

Asia, and more specifically, South Asia, has the largest number of the ten most populous countries within its boundaries. The ten most populous countries (in 2018) are:

10. Japan: 126,168,156

9. Russia: 142,122,776

8. Bangladesh: 159,453,001

7. Nigeria: 195,300,343

6. Pakistan: 207,862,518

5. Brazil: 208,846,892

4. Indonesia: 262,787,403

3. United States: 329,256,465

2. India: 1,296,834,042

1. China: 1,384,688,986