Which mountain range runs through Nagaland?

Concept: India’s mountain systems are classified by physiographic division — the Himalayan arc forms the country’s northern boundary, the Purvanchal (Eastern Hills) system — including the Patkai, Naga, and Mizo ranges — extends south from the eastern Himalayan syntaxis along the India–Myanmar border, and the Peninsular plateau carries much older ranges such as the Aravalli in the northwest and the Eastern Ghats along the east coast.

Application: Nagaland lies in India’s far northeastern corner, bordering Myanmar. The Patkai Range — the segment of the Purvanchal hill system that runs along this stretch of the India–Myanmar border — crosses eastern Nagaland; Mount Saramati, the state’s highest peak, sits near where the Patkai merges with the neighbouring Naga Hills.

Cross-check: Comparing this against the other offered ranges confirms the choice:

• Himalayan Range — the main Himalayan arc runs through Jammu & Kashmir, Himachal Pradesh, Uttarakhand, Sikkim, and Arunachal Pradesh, a separate physiographic system from the Purvanchal hills of Nagaland.

• Eastern Ghats — this range runs along India’s eastern coast from Odisha to Tamil Nadu, far south of the northeastern hill states.

• Aravalli Range — this range lies in northwestern India, running through Rajasthan, Haryana, and Gujarat.

None of these three reach Nagaland, so the Patkai Range is the mountain system running through it.