NCERT Class 11 Indian Geography Chapter 2 – Structure and Physiography

NCERT Class 11 Indian Geography Chapter 2 explains the geological structure and major physiographic divisions of India. In NCERT Class 11 Indian Geography Chapter 2, students understand how India’s landforms such as the Himalayas, Northern Plains and Peninsular Plateau were formed and how they influence climate, drainage and soil patterns.

NCERT Class 11 Indian Geography Chapter 2 is highly important for CBSE board exams and competitive exams like UPSC and BPSC because map-based and analytical questions are frequently asked from physiographic regions. A clear understanding of NCERT Class 11 Indian Geography Chapter 2 builds a strong base for topics like drainage, climate and natural vegetation. Students should refer to the official NCERT website at for authentic textbooks and syllabus updates.

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1. Introduction

• The Earth is approximately 460 million years old, and its present landforms are the result of long geological evolution caused by endogenic (internal) and exogenic (external) forces.
• The Indian Plate, once located south of the equator, was originally part of a larger landmass that also included the Australian Plate, and later drifted northward due to plate tectonics.
• The continuous northward movement of the Indian Plate led to the formation of the Himalayas and significantly influenced the geological and geomorphological structure of the Indian subcontinent.
• The collision between the Indian Plate and Eurasian Plate caused folding, faulting and upliftment, resulting in major landforms such as young fold mountains and extensive sedimentary basins.
• Geological structure and relief of India are outcomes of the interaction between lateral plate movements, vertical movements and surface processes like erosion, weathering and deposition.
• Based on geological variations, India is divided into three major divisions: The Peninsular Block, The Himalayas and other Peninsular Mountains, and the Indo-Ganga-Brahmaputra Plain.
• These geological divisions broadly correspond to India’s major physical features and explain regional differences in relief, drainage, soil formation and physiography.
• The continuous tectonic activity in the Himalayas indicates that the Indian Plate is still moving northward, making the region geologically active and earthquake-prone.

2. The peninsular block

• The northern boundary of the Peninsular Block runs irregularly from Kachchh, along the western flank of the Aravali Range (near Delhi), roughly parallel to the Yamuna and Ganga, up to the Rajmahal Hills and the Ganga Delta.
• Extensions of this block include Karbi Anglong Plateau, Meghalaya Plateau in the northeast and parts of Rajasthan in the west, separated by the Malda Fault (West Bengal) from the Chotanagpur Plateau.
• The Peninsular Block is composed mainly of very ancient gneisses and granites, forming one of the oldest and most stable landmasses of India.
• Since the Cambrian period, this region has remained relatively rigid and stable, unlike the tectonically active Himalayan region.
• As part of the Indo-Australian Plate, it has experienced vertical movements and block faulting, leading to the formation of rift valleys of Narmada, Tapi and Mahanadi and the Satpura block mountains.
• The region consists largely of relict and residual mountains such as the Aravali Hills, Nallamala Hills, Javadi Hills, Veliconda Hills, Palkonda Range, and Mahendragiri Hills.
• Rivers of the Peninsular Block generally have shallow valleys and low gradients, indicating a mature stage of erosion compared to youthful Himalayan rivers.
• Most east-flowing rivers like Mahanadi, Godavari, Krishna and Kaveri form large deltas before entering the Bay of Bengal, while west-flowing rivers like Narmada and Tapi flow into the Arabian Sea without forming deltas.
• Due to tectonic activity during Himalayan formation, a major fault developed between Rajmahal Hills and Meghalaya Plateau, isolating the Meghalaya Plateau, which is divided into Garo Hills, Khasi Hills and Jaintia Hills.
• The Meghalaya Plateau is rich in minerals such as coal, iron ore, sillimanite, limestone and uranium, and receives very high rainfall, resulting in heavy erosion; Cherrapunji shows bare rocky surfaces due to intense rainfall.

3. The Himalayas and other peninsular mountains

• The Himalayas and associated mountains are young fold mountains, geologically weak, flexible and tectonically active, unlike the stable Peninsular Block.
• These mountains were formed due to the collision of the Indian Plate with the Eurasian Plate, leading to folding, faulting and thrusting, and are still rising due to ongoing plate movement.
• The region experiences active endogenic forces resulting in frequent earthquakes, while exogenic forces create landforms like gorges, V-shaped valleys, rapids and waterfalls.
• The Himalayas consist of parallel ranges: Greater Himalayas (Himadri), Lesser Himalayas (Himachal) and Shiwalik Range, forming a strong physical barrier between the Indian Subcontinent and Central and East Asia.
• The Greater Himalayas (central axial range) extend about 2,500 km from west to east and vary in width between 160–400 km.
• Orientation of the Himalayas varies regionally:
• In northwest India → Northwest–Southeast direction.
• In Darjeeling and Sikkim → East–West direction.
• In Arunachal Pradesh → Southwest–Northwest direction.
• In Nagaland, Manipur and Mizoram → North–South direction.
• The Himalayas act as a climatic divide, blocking cold winds from Central Asia and influencing the South-West Monsoon system, besides shaping major drainage patterns of India.
• On the basis of relief and geomorphological features, the Himalayas are divided into: Kashmir/Northwestern Himalayas, Himachal and Uttarakhand Himalayas, Darjeeling and Sikkim Himalayas, Arunachal Himalayas, and Eastern Hills and Mountains.
• The Kashmir or Northwestern Himalayas include ranges such as Karakoram, Ladakh, Zaskar and Pir Panjal, with the famous Kashmir Valley located between the Great Himalayas and Pir Panjal.
• Important glaciers of South Asia like Siachen Glacier and Baltoro Glacier are located here, along with unique Karewa formations suitable for cultivation of Zafran (saffron).
• Major mountain passes include Zoji La (Great Himalayas), Banihal (Pir Panjal), Photu La (Zaskar) and Khardung La (Ladakh Range), which are strategically important.
• Important lakes in this region include Dal Lake and Wular Lake (freshwater) and Pangong Tso and Tso Moriri (saltwater).
• The region is drained by the Indus River and its tributaries Jhelum and Chenab, contributing to the northwestern drainage system.

4. Indo-Ganga-Brahmaputra plain

• The Indo-Ganga-Brahmaputra Plain is the third major geological division of India, formed by the depositional work of the rivers Indus, Ganga and Brahmaputra.
• Originally, it was a geosynclinal depression that developed during the third phase of Himalayan formation about 64 million years ago.
• Over time, this depression was filled with sediments brought by the Himalayan rivers and Peninsular rivers, creating an extensive alluvial plain.
• The average depth of alluvial deposits in this plain ranges between 1,000–2,000 metres, making it one of the deepest sedimentary basins.
• This region is characterised by a relatively flat topography and fertile alluvial soils, supporting dense population and intensive agriculture.
• The plain forms a continuous stretch from the Indus basin in the west, through the Ganga basin, to the Brahmaputra valley in the east.
• The depositional processes of these rivers have created various landforms like floodplains, levees and deltas, especially the Sunderbans Delta, one of the largest deltas in the world.
• Geological structure of this region significantly influences India’s relief, drainage pattern and agricultural productivity.

5. Physiography

• Physiography means the physical features of a region formed by the interaction of geological structure, geomorphological processes and stage of landform development.
• India shows great diversity in relief due to long-term action of endogenic forces (internal forces like plate movement) and exogenic forces (external forces like erosion and deposition).
• The northern part of India consists of rugged topography with high mountain ranges, deep valleys and gorges, mainly represented by the Himalayas.
• The southern region is characterised by a stable tableland of the Peninsular Plateau, marked by dissected plateaus, residual hills and escarpments.
• Between the northern mountains and southern plateau lies the extensive Northern Plain, formed by the depositional work of major river systems.
• Based on broad physical variations, India is divided into six major physiographic divisions: The Northern and North-eastern Mountains, The Northern Plain, The Peninsular Plateau, The Indian Desert, The Coastal Plains and The Islands.
• These divisions reflect the influence of geological history, tectonic activity and surface processes in shaping India’s present landforms.

6. The North and Northeastern Mountains

• The North and Northeastern Mountains consist of the Himalayas and the Northeastern Hills, forming the northern boundary of India.
• The Himalayas are arranged in parallel ranges: Greater Himalayas (Himadri), Lesser Himalayas (Himachal) and Shiwalik Range, extending about 2,500 km from west to east with a width of 160–400 km.
• The general alignment of the Himalayas in the northwestern part is Northwest–Southeast, while in Darjeeling and Sikkim it is East–West, in Arunachal Pradesh it is Southwest–Northwest, and in Nagaland, Manipur and Mizoram it runs North–South.
• The Himalayas act as a major physical, climatic and drainage divide, protecting India from cold winds of Central Asia and influencing the South-West Monsoon.
• On the basis of regional variations, the Himalayas are divided into: Kashmir/Northwestern Himalayas, Himachal and Uttarakhand Himalayas, Darjeeling and Sikkim Himalayas, Arunachal Himalayas and Eastern Hills and Mountains.
• The Kashmir Himalayas include ranges like Karakoram, Ladakh, Zaskar and Pir Panjal, and contain important glaciers such as Siachen and Baltoro, and lakes like Dal, Wular, Pangong Tso and Tso Moriri.
• Important mountain passes include Zoji La, Banihal, Photu La and Khardung La, which are strategically significant.
• The northeastern extension includes the Patkai Bum, Naga Hills, Manipur Hills and Mizo (Lushai) Hills, forming a curved chain connecting the Himalayas with Southeast Asia.

7. The Northern Plains

• The Northern Plains have been formed by the depositional work of the rivers Indus, Ganga and Brahmaputra and their tributaries, creating an extensive alluvial plain.
• The plain is characterised by a general elevation of 50–150 metres above mean sea level and is one of the most fertile and densely populated regions of India.
• From north to south, the plain is divided into Bhabar, Tarai, Bhangar and Khadar based on relief and depositional features.
• The Bhabar belt lies along the foothills of the Himalayas where rivers deposit coarse materials like pebbles and disappear underground due to porous deposits.
• South of Bhabar lies the Tarai belt (approximately 10–20 km wide) where rivers re-emerge, creating marshy and swampy conditions with rich natural vegetation and wildlife.
• The Bhangar represents older alluvium forming slightly elevated terraces, while the Khadar consists of newer alluvium deposited annually by floods.
• The plains display mature fluvial landforms such as meanders, ox-bow lakes, braided channels and sand bars, especially in the Brahmaputra Plains.
• The Sunderbans Delta, formed by the Ganga-Brahmaputra system, is one of the largest deltas in the world, while Haryana and Delhi act as a water divide between the Indus and Ganga river systems.

8. The Peninsular Plateau

• The Peninsular Plateau is a triangular tableland rising from about 150 metres above the Northern Plains to an elevation of 600–900 metres, and is one of the oldest and most stable landmasses of India.
• Its outer boundaries include the Delhi Ridge (extension of Aravalis) in the northwest, Rajmahal Hills in the east, Gir Range in the west and Cardamom Hills in the south; it also extends northeastward as the Shillong and Karbi-Anglong Plateau.
• The plateau consists of several patland plateaus such as the Hazaribagh Plateau, Palamu Plateau, Ranchi Plateau, Malwa Plateau, Coimbatore Plateau and Karnataka Plateau.
• The general slope of the plateau is from west to east, which is reflected in the eastward flow of major rivers like Mahanadi, Godavari, Krishna and Kaveri into the Bay of Bengal.
• West-flowing rivers such as Narmada and Tapi flow into the Arabian Sea and generally do not form deltas, unlike the east-flowing rivers.
• Important physiographic features of this region include tors, block mountains, rift valleys, spurs, hummocky hills and quartzite dykes, which often serve as natural water storage sites.
• The western and northwestern parts of the plateau have a significant presence of black soil (regur soil), suitable for cotton cultivation.

9. The Indian Desert

• The Indian Desert, also known as the Great Indian Desert or Marusthali, lies to the northwest of the Aravali Hills, mainly covering western Rajasthan and parts of Gujarat.
• It is characterised by an undulating sandy plain with features like longitudinal dunes and barchans (crescent-shaped dunes) formed due to wind action.
• The region receives very low rainfall, generally below 150 mm per year, resulting in an arid climate and sparse vegetation cover.
• Due to extreme dryness and high evaporation, the area has saline lakes such as Sambhar Lake, and ephemeral streams that flow only during the rainy season.
• The river Luni is the only significant river of the desert, flowing southwestward into the Rann of Kachchh.
• The desert region has poor soil fertility, but irrigation projects like the Indira Gandhi Canal have transformed parts of it into agriculturally productive land.
• Wind erosion and deposition are the dominant geomorphic processes shaping the landscape of this region.

10. The Coastal Plains

• The Coastal Plains lie between the Peninsular Plateau and the surrounding seas — the Arabian Sea in the west and the Bay of Bengal in the east.
• The Western Coastal Plain stretches from Gujarat to Kerala and includes the Kathiawar Coast (Gujarat), Konkan Coast (Maharashtra), Goan Coast and Malabar Coast (Karnataka and Kerala).
• The western coastal plain is generally narrow in the middle and broader towards the north and south; rivers flowing here like Narmada and Tapi do not form deltas.
• A unique feature of the Malabar Coast is the presence of Kayals (backwaters) such as Punnamada Kayal, where the famous Nehru Trophy Vallamkali (boat race) is held annually in Kerala.
• The Eastern Coastal Plain is broader and is considered an example of an emergent coast, extending from West Bengal to Tamil Nadu.
• Major rivers like Mahanadi, Godavari, Krishna and Kaveri form well-developed deltas along the eastern coast before entering the Bay of Bengal.
• The eastern coast has a wide continental shelf (up to 500 km), which affects the development of natural ports and harbours.

11. The Islands

• India has two major island groups — one in the Bay of Bengal and the other in the Arabian Sea.
• The Bay of Bengal Islands consist of about 572 islands/islets, located roughly between 6°N–14°N latitude and 92°E–94°E longitude.
• The two principal groups in the Bay of Bengal are the Ritchie’s Archipelago and the Labyrinth Islands, forming part of the Andaman and Nicobar Islands.
• The Andaman Islands are separated from the Nicobar Islands by the Ten Degree Channel (10°N latitude).
• These islands are largely of tectonic origin and are an extension of the submerged mountain range connecting the Arakan Yoma (Myanmar) with the Himalayas.
• The only active volcano in India, located at Barren Island in the Andaman group, lies in this region.
• The islands in the Arabian Sea, mainly the Lakshadweep Islands, are of coral origin and are formed by coral deposits on submerged ridges.
• The strategic location of these islands enhances India’s control over important sea routes in the Indian Ocean.

12. Exam Oriented Facts

• Three Geological Divisions of India: Peninsular Block, Himalayas and Other Peninsular Mountains, Indo-Ganga-Brahmaputra Plain.
• Major Himalayan Ranges: Greater Himalayas (Himadri), Lesser Himalayas (Himachal), Shiwalik Range; important regional divisions include Kashmir/Northwestern Himalayas, Himachal and Uttarakhand Himalayas, Darjeeling and Sikkim Himalayas, Arunachal Himalayas, Eastern Hills and Mountains.
• Important Himalayan Mountain Ranges (Northwest): Karakoram, Ladakh, Zaskar, Pir Panjal; northeastern extensions include Patkai Bum, Naga Hills, Manipur Hills, Mizo (Lushai) Hills.
• Important Glaciers: Siachen Glacier, Baltoro Glacier (Karakoram region).
• Important Mountain Passes: Zoji La, Banihal, Photu La, Khardung La.
• Important Lakes (Himalayan Region):
  Freshwater → Dal Lake, Wular Lake
  Saltwater → Pangong Tso, Tso Moriri
• Karewa Formations: Found in Kashmir Valley, suitable for Zafran (saffron) cultivation.
• Indo-Ganga-Brahmaputra Plain: Formed by rivers Indus, Ganga, Brahmaputra; average depth of alluvial deposits 1,000–2,000 m; major delta → Sunderbans Delta.
• Divisions of Northern Plain: Bhabar, Tarai (10–20 km wide), Bhangar (old alluvium), Khadar (new alluvium); elevation generally 50–150 m above mean sea level.
• Water Divide: Haryana and Delhi separate Indus and Ganga river systems.
• Peninsular Plateau Boundaries: Delhi Ridge, Aravali Range, Rajmahal Hills, Gir Range, Cardamom Hills; northeastern extension → Shillong Plateau, Karbi-Anglong Plateau.
• Important Peninsular Plateaus: Hazaribagh Plateau, Palamu Plateau, Ranchi Plateau, Malwa Plateau, Coimbatore Plateau, Karnataka Plateau, Chotanagpur Plateau, Meghalaya Plateau (Garo Hills, Khasi Hills, Jaintia Hills).
• Rift Valleys and Block Mountains: Narmada Rift Valley, Tapi Rift Valley, Mahanadi Rift Valley, Satpura Block Mountains.
• Major Peninsular Hills: Nallamala Hills, Javadi Hills, Veliconda Hills, Palkonda Range, Mahendragiri Hills.
• East-Flowing Rivers (Delta Forming): Mahanadi, Godavari, Krishna, Kaveri (flow into Bay of Bengal).
• West-Flowing Rivers (Non-delta forming): Narmada, Tapi (flow into Arabian Sea).
• Indian Desert (Marusthali): Located northwest of Aravali Hills; rainfall below 150 mm annually; important river → Luni; important saline lake → Sambhar Lake; dunes → Longitudinal dunes and Barchans.
• Western Coastal Plains: Kathiawar Coast, Konkan Coast, Goan Coast, Malabar Coast; important backwater → Punnamada Kayal (venue of Nehru Trophy Vallamkali).
• Eastern Coastal Plains: Broad and emergent coast; major deltas of Mahanadi, Godavari, Krishna, Kaveri; wide continental shelf up to 500 km.
• Island Groups:
  Andaman and Nicobar Islands (about 572 islands/islets, located between 6°N–14°N and 92°E–94°E)
  Lakshadweep Islands (coral origin, Arabian Sea).
• Ten Degree Channel (10°N latitude): Separates Andaman Islands from Nicobar Islands.
• Active Volcano of India: Barren Island (Andaman group).
• Physiographic Divisions of India:
  The Northern and North-eastern Mountains,
  The Northern Plain,
  The Peninsular Plateau,
  The Indian Desert,
  The Coastal Plains,
  The Islands.

NCERT Class 11 Indian Geography Chapter 2 provides a complete understanding of India’s structural evolution and physical divisions. A strong command over NCERT Class 11 Indian Geography Chapter 2 helps students answer map-based, conceptual and analytical questions confidently in CBSE and competitive exams.

Mastering NCERT Class 11 Indian Geography Chapter 2 also makes it easier to understand river systems and geomorphic processes discussed in the next chapter.

Continue reading NCERT Class 11 Indian Geography Chapter 3 – Drainage System to explore India’s major river systems in detail.

Frequently Asked Questions (FAQs)

Q1. What is NCERT Class 11 Indian Geography Chapter 2 about?
NCERT Class 11 Indian Geography Chapter 2 explains India’s geological structure and major physiographic divisions such as the Himalayas, Northern Plains and Peninsular Plateau.

Q2. Why is NCERT Class 11 Indian Geography Chapter 2 important for exams?
NCERT Class 11 Indian Geography Chapter 2 is important because questions related to mountains, plains, plateaus and map-based identification are frequently asked in CBSE and competitive exams.

Q3. What are the main physiographic divisions in NCERT Class 11 Indian Geography Chapter 2?
The main divisions are the Himalayas, Northern Plains, Peninsular Plateau, Indian Desert, Coastal Plains and Islands.

Q4. How does NCERT Class 11 Indian Geography Chapter 2 help in UPSC preparation?
NCERT Class 11 Indian Geography Chapter 2 builds strong conceptual clarity about India’s physical features, which is essential for geography and environment sections in UPSC and BPSC exams.

Q5. Which chapter should be studied after NCERT Class 11 Indian Geography Chapter 2?
Students should study NCERT Class 11 Indian Geography Chapter 3 – Drainage System next for a better understanding of India’s river systems.

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