Properties are:
(i) The northern plains have been formed from the alluvium deposited by the mountain rivers.
(ii) They are located between the Himalayan rivers in the north and the Peninsular Plateau in the south.
(iii) They turned the soil on the surfaced land fertile for growing a rich harvest of variety of crops. This led to the development of the Indus Valley Civilization.
(iv) They are made up of deposits of alluvium and cover an area of 7 lakh sq. km.
(v) They are densely populated physiographic division of India and are believed to be highly productive in terms of agriculture.