Geography
India: Location and Physiography
The Himalayas
Himalayas for CGPSC: origin, Trans-Himalaya, Himadri, Himachal and Shiwalik, regional divisions, Purvanchal, peaks, passes and significance.
Prerequisites
- India: Location and Extent — the frame on which the mountains sit.
- Basic plate tectonics: plates, convergent boundaries, fold mountains.
The Hook: Why Is Mainpat Called the “Shimla of Chhattisgarh”?
Connect
Every winter, newspapers in Raipur call Mainpat in Surguja the “Shimla of Chhattisgarh”. Mainpat is a flat-topped tableland on the ancient Peninsular block. Shimla sits on the Himalaya (हिमालय), among the youngest mountains on Earth, still rising and still shaking.
How did a range younger than the dinosaurs’ extinction become the highest on the planet, and why do its three parallel walls matter for India’s rivers, monsoon and borders? That is the subject of this page.
Why it matters: Prelims asks about the order of ranges, peaks, passes and the river boundaries of regional divisions. Mains GS-III asks about the Himalaya’s significance and its fragility (earthquakes, landslides, glacial floods).
Origin: Young Fold Mountains
- The Himalaya are young fold mountains formed when the northward-moving Indian plate collided with the Eurasian plate. The collision began roughly 50 million years ago.
- Sediments deposited in the Tethys Sea (टेथिस सागर) between the two landmasses were squeezed and folded upward.
- The process continues: the Indian plate still pushes north, which is why the region is seismically active (Zones IV and V) and the peaks are still rising slightly.
- The range runs in an arc of about 2,400 km from the Indus in the west to the Brahmaputra in the east.
- Width: about 400 km in Kashmir to about 150 km in Arunachal Pradesh. Heights are greater in the east, but the range is wider in the west.
- Syntaxial bends: the arc turns sharply at both ends: near Nanga Parbat in the west and Namcha Barwa in the east.
The Longitudinal Divisions (North to South)
| Division | Hindi | Average height | Key features |
|---|---|---|---|
| Trans-Himalaya | ट्रांस-हिमालय | High, arid | Karakoram, Ladakh and Zaskar ranges; Ladakh plateau; rain-shadow cold desert. K2 (Godwin Austen), 8,611 m, is in the Karakoram |
| Greater Himalaya / Himadri | हिमाद्रि | About 6,000 m | Innermost, continuous, perennially snow-capped; granite core; most high peaks and glaciers; source of Ganga (Gangotri) and Yamuna (Yamunotri) glaciers |
| Lesser Himalaya / Himachal | हिमाचल | 3,700–4,500 m; width about 50 km | Ranges: Pir Panjal, Dhauladhar, Mahabharat; valleys of Kashmir, Kangra and Kullu; hill stations (Shimla, Mussoorie, Nainital, Darjeeling) |
| Outer Himalaya / Shiwalik | शिवालिक | 900–1,100 m; width 10–50 km | Youngest, built of unconsolidated sediments brought down by rivers; Duns (longitudinal valleys) such as Dehradun, Kotli Dun and Patli Dun |
Kashmir Valley and Karewas
The Kashmir Valley lies between the Pir Panjal (Lesser Himalaya) and the Greater Himalaya. Its Karewas are old lake (lacustrine) deposits, famous for saffron (zafran) cultivation.
Regional Divisions (West to East, by Rivers)
| Division | Between the rivers | States |
|---|---|---|
| Punjab Himalaya (Kashmir and Himachal Himalaya) | Indus – Satluj | J&K, Ladakh, Himachal Pradesh |
| Kumaon Himalaya | Satluj – Kali | Uttarakhand |
| Nepal Himalaya | Kali – Tista | Nepal (highest section: Everest, Kanchenjunga region) |
| Assam Himalaya | Tista – Dihang (Brahmaputra) | Sikkim, Arunachal Pradesh |
Beyond the Dihang gorge, the mountains bend south as the Purvanchal.
Purvanchal (Eastern Hills)
| Hills | Where |
|---|---|
| Patkai Bum | Arunachal Pradesh–Myanmar border |
| Naga Hills | Nagaland |
| Manipur Hills | Manipur (Loktak Lake, with floating phumdis) |
| Mizo (Lushai) Hills | Mizoram |
Purvanchal is made largely of strong sandstones (sedimentary rocks) and is covered by dense forest. The Garo, Khasi and Jaintia hills are not Himalayan: they belong to the Meghalaya plateau, an extension of the Peninsular plateau (see Peninsular Plateau).
Important Peaks
| Peak | Height (m) | Note |
|---|---|---|
| Mount Everest (Sagarmatha) | 8,849 | Highest in the world; in Nepal; height re-measured jointly by Nepal and China (2020) |
| K2 / Godwin Austen | 8,611 | Karakoram; in Indian territory as claimed (area under Pakistan’s control) |
| Kanchenjunga | 8,586 | Highest peak in India (in territory India administers), Sikkim–Nepal border |
| Nanda Devi | 7,816 | Highest peak wholly within India, Uttarakhand |
| Kamet | 7,756 | Uttarakhand |
| Namcha Barwa | 7,782 | Tibet, at the eastern syntaxial bend |
Important Passes
| Pass | State / UT | Connects / significance |
|---|---|---|
| Zoji La | Ladakh–Kashmir | Srinagar–Leh road; Zojila tunnel under construction |
| Banihal | Jammu and Kashmir | Jammu–Srinagar across the Pir Panjal (Jawahar tunnel) |
| Khardung La | Ladakh | Leh to the Nubra valley |
| Rohtang | Himachal Pradesh | Kullu–Lahaul; bypassed by the Atal Tunnel (opened October 2020) |
| Shipki La | Himachal Pradesh | Where the Satluj enters India from Tibet; trade route |
| Lipulekh | Uttarakhand | Kailash–Mansarovar pilgrimage route |
| Nathu La | Sikkim | India–China border trade |
| Jelep La | Sikkim | Sikkim–Chumbi valley (Tibet) |
| Bomdi La | Arunachal Pradesh | Route to Tawang |
| Diphu | Arunachal Pradesh | India–Myanmar tri-junction area |
Significance (for Mains)
- Climatic barrier: Blocks cold, dry Central Asian winds in winter and forces the south-west monsoon to shed rain over the plains. Without the Himalaya, north India would be much colder and drier. See Climate.
- Perennial rivers: Glaciers and snowfields feed the Indus, Ganga and Brahmaputra systems, which flow all year. See Drainage.
- Fertile plains: Rivers bring down silt that built the Northern Plains.
- Hydropower: Steep gradients give very large hydropower potential.
- Forests and biodiversity: Tropical to alpine vegetation; part of the Himalaya and Indo-Burma biodiversity hotspots.
- Tourism and pilgrimage: Hill stations and shrines (Amarnath, Kedarnath, Badrinath, Vaishno Devi).
- Defence: A natural wall, but passes and disputed borders make it a strategic frontier.
Fragility and hazards
- Earthquakes: high seismic zones (IV and V).
- Landslides and subsidence: steep slopes, weak young rocks, road-cutting and construction (Joshimath land subsidence drew national attention in January 2023).
- Glacial lake outburst floods (GLOFs) and flash floods: Kedarnath (2013), Chamoli (February 2021) and the South Lhonak lake outburst in Sikkim (October 2023).
- Way forward: carrying-capacity studies, slope-sensitive road design, early-warning systems for glacial lakes, and community-based disaster management.
Memory Tricks
North to south: 'The Great Little Shiwa'
Trans-Himalaya → Greater (Himadri) → Lesser (Himachal) → Shiwalik.
Height goes down and age goes younger as you move south: Shiwalik is both the lowest and the youngest.
Regional divisions: 'I Saw Kali Take Dinner'
Indus – Satluj (Punjab) – Kali (Kumaon) – Tista (Nepal) – Dihang (Assam). The divisions sit between consecutive pairs.
Ranges in the Lesser Himalaya: 'Pir Dhaula Maha'
Pir Panjal (Kashmir), Dhauladhar (Himachal), Mahabharat (Nepal), west to east.
Don’t Confuse
| This | vs | That |
|---|---|---|
| Kanchenjunga — highest peak in India | vs | Nanda Devi — highest peak wholly within India |
| Himadri — Greater Himalaya, about 6,000 m | vs | Himachal — Lesser Himalaya, hill stations |
| Duns — longitudinal valleys in the Shiwalik zone | vs | Duars — plains at the foot of the Bhutan Himalaya (North Bengal, Assam) |
| Purvanchal (Patkai, Naga, Mizo) — Himalayan | vs | Garo–Khasi–Jaintia — Meghalaya plateau, Peninsular |
| Shipki La — Satluj, Himachal | vs | Nathu La — Sikkim trade pass |
Common Mistakes
MCQ traps
- “The Shiwalik is the oldest range of the Himalaya.” False. It is the youngest; the Greater Himalaya is the oldest of the three parallel ranges.
- “The Himalaya are wider in the east.” False. They are wider in the west (about 400 km in Kashmir) and narrower but higher in the east.
- “The Khasi hills are part of the Purvanchal.” False. They belong to the Meghalaya plateau, a detached part of the Peninsular block.
- “The Kumaon Himalaya lies between the Kali and Tista.” False. That is the Nepal Himalaya. Kumaon is Satluj–Kali.
- “Nanda Devi is India’s highest peak.” Only “highest wholly within India”. The highest in India is Kanchenjunga (or K2 if the question counts the whole claimed territory).
Practice
All questions below are original practice questions written in CGPSC style. They are not previous-year questions.
Level 1: Foundation
- The Lesser Himalaya is also called ______.
- Longitudinal valleys between the Lesser Himalaya and the Shiwalik, such as Dehradun, are called ______.
- The Kumaon Himalaya lies between the rivers ______ and ______.
Answers
- Himachal.
- Duns.
- Satluj and Kali.
Level 2: Prelims MCQs
Q1. Consider the following statements about the Himalaya:
- The Shiwalik range is the youngest of the three parallel ranges.
- The Himalaya are wider in Arunachal Pradesh than in Kashmir.
- Hill stations such as Shimla and Mussoorie lie in the Lesser Himalaya.
Which of the statements given above is/are correct?
- (a) 1 only
- (b) 1 and 3 only
- (c) 2 and 3 only
- (d) 1, 2 and 3
Answer and explanation
(b) 1 and 3 only. The Shiwalik, built from river-borne sediments, is the youngest range. The Himalaya are about 400 km wide in Kashmir but only about 150 km in Arunachal, so statement 2 is wrong. Most hill stations are on the Lesser Himalaya (Himachal).
Q2. Match List I (Pass) with List II (State / UT):
| List I | List II |
|---|---|
| A. Shipki La | 1. Sikkim |
| B. Nathu La | 2. Uttarakhand |
| C. Lipulekh | 3. Himachal Pradesh |
| D. Bomdi La | 4. Arunachal Pradesh |
- (a) A-3, B-1, C-2, D-4
- (b) A-1, B-3, C-2, D-4
- (c) A-3, B-2, C-1, D-4
- (d) A-3, B-1, C-4, D-2
Answer and explanation
(a) A-3, B-1, C-2, D-4. Shipki La (Himachal) is where the Satluj enters India. Nathu La is in Sikkim. Lipulekh in Uttarakhand is on the Kailash–Mansarovar route. Bomdi La in Arunachal is on the way to Tawang.
Q3. Which of the following is the highest peak lying wholly within India?
- (a) Kanchenjunga
- (b) Nanda Devi
- (c) Kamet
- (d) K2
Answer and explanation
(b) Nanda Devi (7,816 m, Uttarakhand). Kanchenjunga is higher but lies on the Sikkim–Nepal border. K2 is in the Karakoram, in the area under Pakistan’s control. Kamet (7,756 m) is lower than Nanda Devi.
Q4. Arrange the following from north to south:
- Shiwalik 2. Karakoram 3. Pir Panjal 4. Greater Himalaya
- (a) 2, 4, 3, 1
- (b) 4, 2, 3, 1
- (c) 2, 3, 4, 1
- (d) 2, 4, 1, 3
Answer and explanation
(a) 2, 4, 3, 1. Karakoram (Trans-Himalaya) → Greater Himalaya → Pir Panjal (Lesser Himalaya) → Shiwalik (Outer Himalaya).
Level 3: Mains Answer Writing
Q1. (150–200 words) “The Himalaya are India’s lifeline as well as its most fragile landscape.” Discuss.
Model answer outline
- Intro: Young fold mountains (Indian–Eurasian plate collision), 2,400 km arc, three parallel ranges plus Trans-Himalaya.
- Lifeline:
- Climatic barrier against cold winds; monsoon rain on the plains.
- Perennial rivers (Indus, Ganga, Brahmaputra) from glaciers.
- Silt that built the Northern Plains, India’s food bowl.
- Hydropower, forests, biodiversity, tourism and pilgrimage.
- Strategic frontier.
- Fragile: seismic Zones IV–V; landslides; GLOFs (Kedarnath 2013, Chamoli 2021, South Lhonak 2023); Joshimath subsidence (2023); unplanned roads and construction.
- Way forward: carrying-capacity norms, slope-sensitive engineering, glacial-lake early warning, community disaster preparedness.
- Chhattisgarh angle: The state’s own uplands (Mainpat, Samri pat) are ancient and stable plateaus; the contrast highlights why Himalayan development needs special care.
- Conclusion: Development in the Himalaya must follow the mountain’s limits, not the plains’ templates.
Quick Revision Table
| Fact | Detail |
|---|---|
| Type | Young fold mountains; Indian–Eurasian plate collision; Tethys sediments |
| Length / width | About 2,400 km; 400 km (Kashmir) to 150 km (Arunachal) |
| Trans-Himalaya | Karakoram, Ladakh, Zaskar; K2 8,611 m |
| Himadri | Greater Himalaya; average about 6,000 m |
| Himachal | Lesser Himalaya; 3,700–4,500 m; Pir Panjal, Dhauladhar, Mahabharat; hill stations |
| Shiwalik | Outer; 900–1,100 m; youngest; Duns |
| Regional divisions | Punjab (Indus–Satluj), Kumaon (Satluj–Kali), Nepal (Kali–Tista), Assam (Tista–Dihang) |
| Purvanchal | Patkai Bum, Naga, Manipur, Mizo hills |
| Highest in India | Kanchenjunga 8,586 m |
| Highest wholly in India | Nanda Devi 7,816 m |
| Passes | Zoji La, Banihal, Khardung La, Rohtang, Shipki La, Lipulekh, Nathu La, Jelep La, Bomdi La |
Key Takeaways
Key Takeaways
- The Himalaya are young fold mountains, still rising and seismically active.
- Learn the parallel ranges north to south with their heights: Trans → Himadri → Himachal → Shiwalik.
- The regional divisions are bounded by rivers: Indus, Satluj, Kali, Tista, Dihang.
- Kanchenjunga is India’s highest peak; Nanda Devi is the highest wholly within India.
- For Mains, pair significance (rivers, monsoon, defence) with fragility (quakes, GLOFs, subsidence).
What’s Next
- The Northern Plains — built from Himalayan silt
- Drainage System of India — Himalayan rivers in detail
- Environment and Ecology — disasters and mountain ecosystems
- Chhattisgarh: Physiographic Divisions — Mainpat and the pats compared
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