Question

which region of the world has high concentration of population and why

Answer 1

plain areas of world arw Densely populated.
South Eastern or southern area of asia including china India area

Answer 2

Southeast Asian countries have the highest range of population recorded till now. Southeast Asian countries with high population are Indonesia, Philippines, vietnam, China, India, etc. These countries are highly populated because of the suitable climatic condition, good medication facilities which help in increasing the life span of people and thus increasing the population of the place.