It is an aggradational plain formed by the alluvial deposits brought down by Indus, Ganga and Brahmaputra rivers and their tributaries.
It is a flat regular transition zone between the Siwaliks in the North and Peninsular plateau in the South. It is separated from Siwaliks by Himalayan Front Fault (HFF).
The plain stretches for about 2400 km from West to East and it has varying width from about 500 km in Punjab to 90 km in Assam.
The depth of these sediments is not fully known but they are deepest near Ambala in Punjab. There the depth of these sediments is around 8000 m.
The plains are remarkably homogenous with little variation in relief features for hundreds of kilometers. Because of this there is frequent flooding in the plains by the rivers.
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