Indian Geography / Physiography
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The Northern plains of India are one of the youngest geological unit in India. They are located towards the south of the foothills of the Himalayas and towards the north of the Peninsular India. They have Purvanchal hills as their eastern boundary. Northern plains were formed due to deposition of sediments that were brought down by the three major river systems namely, Indus, Ganges, Brahmaputra and their tributaries. They are either flat or gently sloping in nature.