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, about 2400 km long and about 240 to 320 km broad. It is divided into three sections, viz. the Punjab Plain, the Ganga Plain and the Brahmaputra Plain.
The Punjab plain lies in the western part of the northern plain & formed by the Indus and its tributaries with major portion of this plains in Pakistan