Explanation:

Mountain ranges on the eastern Borders of India

The Purvanchal Mountains cover the states of Arunachal Pradesh, Assam, Manipur, Mizoram, Nagaland and Meghalaya.The range is an eastern extension of the Himalayan Range System, in north eastern India. It bends sharply to the south beyond the Dihang River gorge, and spreads along the eastern boundary of India with Myanmar. The Purvanchal range includes the hill ranges of the Patkai, Barail Range, Naga Hills, Lushai Hills and Jampui Hills. The Garo Hills, Khasi Hills and Jaintia Hills in Meghalaya are part of Shillong Plateau, and not part of the Purvanchal range, geologically speaking. Similarly Mikir Hills, Tiwa Hills and Cachar Hills in Assam are geological part of Karbi Anglong Plateau.