The distribution of population in the world is highly uneven. Population density varies from place to place and from time to time. It may vary from less than one person per sq. km (in the deserts) to over 1000 person per sq. km (in other areas). Areas of low density of population arc large while that of high density are small and scattered. Variations in population density are due to the differ­ence in human response to the environment. Regions of high density (1000 persons per sq. km)

(i) Eastern Asia which includes, Japan, China and Korea,

(ii) Southern Asia including India, Bangladesh and Pakistan.

(iii) Nile valley in Africa and Java in Indonesia.

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(iv) Northwest Europe including Great Britain, France, Belgium, the Nether­lands and Denmark.

(v) Northeast United States comprising of regions between the Great Lakes and the Atlantic coast.

Reasons (i) High density of population in the first three regions of Asia and Africa is due to intensive agriculture in the fertile lowlands which receive adequate rainfall or are well irrigated.

(ii) The other two regions of USA and Europe have concentration of popula­tion due to industrialization and urbanization.