Give an account of the northern plains of India.​

The northern plains are mainly formed by the alluvial deposits. The northern plain has been formed by the interconnection of the three major river systems. They are the Indus, the Ganga and the Brahmaputra along with their tributaries. This plain is completely formed of alluvial soil.

Explanation:

The northern plain has been formed by the interplay of the three major river systems, namely– the Indus, the Ganga and the Brahmaputra along with their tributaries. This plain is formed of alluvial soil. The deposition of alluvium in a vast basin lying at the foothills of the Himalaya over millions of years, formed this fertile plain. It spreads over an area of 7 lakh sq. km. The plain being about 2400 Km long and 240 to 320 Km broad, is a densely populated physiographic division. With a rich soil cover combined with adequate water supply and favourable climate it is agriculturally a very productive part of India