The correct option is North-East.
Explanation
The Purvachal Hills, also known as the Eastern Hills and Mountains, constitute the eastern extension of the Himalayan mountain system. They are located in the northeastern part of India.
Geographical Analysis:
- Location: The Himalayas bend sharply to the south beyond the Dihang Gorge and spread along the eastern boundary of India. This region is collectively known as the Purvachal.
- Extent: These hills cover the states of Arunachal Pradesh, Nagaland, Manipur, Mizoram, Tripura, and eastern Assam.
- Composition: They are mostly composed of strong sandstones, which are sedimentary rocks. The region is covered with dense forests.
- Major Ranges: The Purvachal comprises various hill ranges running mostly as parallel ranges and valleys, including the Patkai Bum, Naga Hills, Manipur Hills, and Mizo (Lushai) Hills.
Key Takeaway:
The Purvachal Hills are the southward extension of the Himalayas located in North-East India, forming the boundary between India and Myanmar.