The Northern Plain was formed by the interplay of the three major river systems, namely– the Indus, the Ganga and the Brahmaputra along with their tributaries. It is composed of alluvial soil which has been deposited over millions of years. It is about 2400 km long and about 240 to 320 km broad. With a rich soil cover combined with adequate water supply and favorable climate. It is agriculturally a very productive part of India.