Question

which regions of the world have high concentration of population why

Answer 1

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━━━━━━━━━━━━━━━━━━━$\mathfrak{\green{Answer.}}$Which Country is the World's Most Densely Populated?

Macau is the most densely populated region in the world, with 48,003 people per square mile (18,534 people per square kilometer). ...

Singapore is the world's third most densely populated place with 18,513 people per every square mile. ...

Hong Kong, like Macau, is a Special Administrative Region (SAR) of China.


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Answer 2

The region's of the world have high  concentration of population due to favourable climatic conditions, rich fertile soil, well developed agriculture and high level of industrialisation.