The Purvanchal Hills

Where the Himalaya Turns South

• What it is: the easternmost extension of the Himalaya, in India’s northeast.
• Where it starts: the Himalaya bends sharply south near the Dihang Gorge, at a point called the Eastern Syntaxial Bend.
• The border: the range runs along India’s border with Myanmar, and touches Bangladesh and China too — a genuinely international frontier zone.
• Where it runs: spans Arunachal Pradesh, Nagaland, Manipur, Mizoram, Tripura, and parts of Assam.

Worked example: trace the Himalaya on a map from Kashmir eastward. Around the Brahmaputra, the whole range abruptly turns and heads south instead of continuing east. That single hairpin turn is the Eastern Syntaxial Bend. Everything south of it is Purvanchal.

Four Hill Systems, Not One

• The components: its main components are the Patkai Hills, Naga Hills, Manipur Hills, and Mizo Hills.
• Patkai: sits on the Arunachal Pradesh-Myanmar border, at the range’s northern end — marking the point where the Purvanchal properly begins.

A Ring Around a Valley

• Manipur Hills: form an oval ring around the central Imphal Valley, with elevations between about 900 and 2,100 metres. They shelter the valley below from harsh weather.
• Mizo Hills: mainly in Mizoram, run as alternating parallel ridges and valleys, with elevations from about 150 to over 1,500 metres across the state.
• Highest point: Saramati, on the Nagaland-Myanmar border, is the highest peak in the entire Purvanchal system, at roughly 3,826 metres.

Islands That Float on the Lake

• Loktak Lake: inside the ring formed by the Manipur Hills. It’s the largest freshwater lake in northeast India, and a designated Ramsar wetland.
• Phumdis: its surface holds phumdis, thick floating mats of vegetation and soil — some sturdy enough to support entire fishing villages.
• A floating park: Keibul Lamjao National Park, built on the lake’s phumdis, is the world’s only floating national park, and home to the endangered Sangai deer.

Four Big Cats, One Forest

• Namdapha: in Arunachal Pradesh’s Patkai Hills, near the Myanmar border. It’s likely the only protected area on Earth holding all four big cats.
• The four: tiger, leopard, clouded leopard, and snow leopard all share this single reserve, split across its different forest zones.
• Why that’s possible: Namdapha’s habitats range from tropical rainforest to alpine meadow, letting species with very different needs coexist within one park.

Same Collision, Different Direction

• Shared origin: the Purvanchal formed through the same tectonic collision that raised the main Himalaya. It just curved south around the syntaxial bend.
• A real contrast: this makes it geologically continuous with the Himalaya — distinct from unrelated systems like the Vindhya or Satpura.
• A distinct biodiversity zone: the hills fall within the Indo-Malayan biodiversity realm, giving them a species mix found nowhere else in India.

A Blue Peak Wrapped in Cloud

• Phawngpui: the “Blue Mountain,” Mizoram’s highest peak, at about 2,157 metres. It sits deep in the Mizo Hills, near the Myanmar border.
• Why “Blue”: a thin, near-constant layer of cloud gives the mountain its distinctive blue look from a distance, and its name.
• Protected: Phawngpui National Park, established in 1992, protects the peak’s rich flora, fauna, and butterfly diversity.

A Valley Famous for Its Flowers

• Dzukou Valley: straddling the Nagaland-Manipur border, at about 2,452 metres, is famous for its seasonal wildflower blooms.
• Rare birds: also home to rare, vulnerable species like Blyth’s tragopan, Nagaland’s state bird, along with the rufous-necked hornbill and the dark-rumped swift.
• Farming here too: many local communities across these hills practise jhum, or shifting, cultivation. They farm a plot for a few years, then move on to let it recover.

Seventeen Tribes, One Stage

• Hornbill Festival: every December, Nagaland’s Hornbill Festival brings together all major Naga tribes. It’s held at Kisama village, near Kohima in the Naga Hills.
• What happens: each tribe builds its own traditional morung hut, and performs its own dances, songs, and cuisine — all in one shared space.
• Why it started: launched in 2000 to promote tourism, it has since become a genuine platform for Naga cultural unity across a very diverse hill population.

A Hillside Carved With Faces

• Unakoti: in Tripura’s Jampui Hills. It holds one of India’s largest collections of rock-cut carvings, dating to roughly the 7th to 9th centuries.
• The centrepiece: its best-known carving is a 30-foot rock-cut face of Shiva, among the largest bas-relief figures anywhere in India.
• Recognition: Unakoti joined UNESCO’s tentative World Heritage list in December 2022, still waiting on full inscription. It’s a rare archaeological anchor in a range better known for its hills than its monuments.

Fire Races Toward Manipur’s Highest Peak (2026)

• The fire: in late January 2026, a wildfire in Dzukou Valley spread for several days toward Mount Esii, Manipur’s highest peak. NDRF teams were deployed. (Source: Deccan Herald)
• The response: the Indian Air Force and Assam Rifles joined containment efforts. Dry weather and strong winds had fanned the blaze across these forested slopes. (Source: Deccan Herald)
• Why it matters here: this is the same flower-famous, bird-rich valley described earlier in this article. Steep, forested terrain like this is exactly the kind of place dry-season fires threaten most.