Which is the densely populated region in India?

The Northern Plains are the most densely populated region of India because -

• The perennial rivers originating from the Himalayas deposits fresh alluvial soil all through the year. Hence, the soil is very fertile for farming.

• These rivers also provide the region with enough water for irrigation and human-use and also serve as cheap means of transport.

• The flat land enables easy construction of road and railway tracks in the plains.

• The plains also have major industrial, commercial and religious cities located there, like Kanpur, Agra, Delhi, Lucknow, Varanasi, Haridwar, etc.

Thus, the perennial rivers of the Himalayas, relatively flat land and the presence of major cities enables the northern plains to provide for much large population than anywhere else in India.