(a) The Himalayan uplift out of the Tethys sea and subsidence of the Northern flank of the peninsular plateau resulted in the formation of a large basin. In course of time, this depression gradually got filled with deposition of sediments from rivers flowing from the mountains In the north and led to formation of the fertile Northern plains.
(b) It spreads over an area of 7 lakh sq km. The plain IS about 2400 km long and 240-230 km broad
(c) It is a densely populated and an Intensively cultivated area.
(d) With Its adequate water supply and favourable climate, It is agriculturally a very productive part of India
(e) The Northern plains are broadly divided into 3 sections.
(f) The Western part of the Northern plans IS called the Punjab plains, formed by the Indus and its tributaries.
(g) The Ganga plain extends between the Ghaggar and the Teesta rivers, spread over the states of Haryana, Delhi, UP Bihar and West Bengal.
(h) The Brahmaputra Plain to the East of the Ganga plains lies the Brahmaputra plain covering the areas of Assam and Arunachal Pradesh