Topic overview
- The six broad divisions are the Northern Mountains, Northern Plains, Peninsular Plateau, Indian Desert, Coastal Plains and Islands.
- Each division differs in relief, rocks, soils, drainage, climate, natural resources, settlement and economic activity.
- The Himalayas are young fold mountains, the Northern Plains are depositional alluvial plains and the Peninsular Plateau is an ancient stable block.
- UP examinations frequently test Himalayan divisions, Bhabar-Terai-Bhangar-Khadar, plateau ranges, coastal plains, island groups and physiographic significance.
Physiographic Divisions of India: Relief, Features and Significance
| No. | Division / Feature | Period | Physical geography | What to remember |
|---|---|---|---|---|
| 1 | Trans-Himalaya | Northern mountain system | Karakoram, Ladakh and Zanskar ranges | High-altitude cold desert and mountain region north of the main Himalayan ranges, with glaciers, passes and sparse settlement. |
| 2 | Himalayan ranges | Young fold mountains | Himadri, Himachal and Shiwalik | Parallel ranges from north to south with high peaks, glaciers, valleys, foothills and active tectonic processes. |
| 3 | Purvanchal and northeastern hills | Eastern extension | Patkai, Naga, Manipur, Mizo and associated hills | Curved eastern continuation of the Himalayas with folded terrain, heavy rainfall, forests and valleys. |
| 4 | Northern Plains | Alluvial depositional region | Indus, Ganga and Brahmaputra systems | Flat fertile plains formed by alluvium; include Bhabar, Terai, Bhangar and Khadar belts. |
| 5 | Peninsular Plateau | Ancient stable block | Central Highlands and Deccan Plateau | Old crystalline rocks, mineral resources, dissected relief, broad uplands and major river basins. |
| 6 | Western and Eastern Ghats | Plateau margins | Sahyadri and discontinuous eastern escarpments | Western Ghats are higher and more continuous; Eastern Ghats are discontinuous and cut by rivers flowing to the Bay of Bengal. |
| 7 | Indian Desert | Arid western region | Thar, dunes, ephemeral streams and salt marshes | Low rainfall, high evaporation, sandy terrain, shifting dunes and seasonal drainage; the Luni is an important river. |
| 8 | Western Coastal Plain | Narrow coastal strip | Konkan, Kannad and Malabar coasts | Narrow plain between Western Ghats and Arabian Sea with estuaries, lagoons, ports and heavy monsoon rainfall in sections. |
| 9 | Eastern Coastal Plain | Broad coastal strip | Northern Circars and Coromandel Coast | Broader and more deltaic coast along the Bay of Bengal, shaped by east-flowing rivers and cyclones. |
| 10 | Andaman and Nicobar Islands | Bay of Bengal island group | Submerged mountain chain and island arcs | Hilly, forested and tectonically active islands; Barren Island is associated with India's active volcanic activity. |
| 11 | Lakshadweep Islands | Arabian Sea island group | Coral atolls and reefs | Low-lying coral islands and atolls with lagoons, vulnerable to sea-level rise and coastal hazards. |
| 12 | Physiographic drainage and soils | Regional linkages | Relief, rivers and weathering | Relief controls river direction, soil formation, erosion, irrigation potential, agriculture, settlement and natural hazards. |
| 13 | Natural resources and economy | Regional significance | Minerals, forests, farms, ports and tourism | Plateaus support minerals, plains agriculture, mountains forests and hydropower, coasts ports and fisheries, and islands tourism and marine resources. |
| 14 | Hazards and environmental sensitivity | Physical risk | Earthquakes, landslides, floods, droughts, cyclones and coastal change | Sustainable planning must match infrastructure and livelihoods with the carrying capacity and hazards of each division. |
Concept 1
Northern Mountains: Himalayas and Northeastern Hills
The Northern Mountains are young fold systems with major climatic, hydrological, ecological and strategic significance.
Step-by-step explanation
- The Trans-Himalaya includes high ranges such as Karakoram, Ladakh and Zanskar and contains glaciers, passes and cold-desert landscapes.
- The Greater Himalaya or Himadri is the highest and most continuous range, with major peaks, glaciers and headwaters of rivers.
- The Lesser Himalaya or Himachal contains ranges, valleys, hill stations and more varied settlement and agriculture.
- The Shiwalik is the southernmost and youngest range, made of unconsolidated sediments and associated with duns and foothill fans.
- The eastern Himalaya bends southward into Purvanchal hills including Patkai, Naga, Manipur and Mizo ranges.
- The mountains intercept monsoon winds, generate orographic rainfall, store snow and ice and feed perennial rivers.
- They contain forests, biodiversity, tourism, hydropower, medicinal resources and strategic passes but are tectonically fragile.
- Earthquakes, landslides, flash floods, glacier hazards and unplanned construction require risk-sensitive mountain development.
Key points
- Trans-Himalaya north of main ranges
- Himadri highest and glaciated
- Himachal valleys and ranges
- Shiwalik youngest foothill range
- Purvanchal eastern continuation.
Worked examples
- Arranging Himalayan ranges north to south
- Explaining mountain rainfall and rivers
Additional examples
- Arranging Himalayan ranges north to south
- Explaining mountain rainfall and rivers
Important distinctions
- Himadri is high and glaciated; Shiwalik is lower, younger and made of loose sediments.
- Western Himalaya is generally drier in parts; eastern Himalaya receives heavier monsoon rainfall.
Common misconceptions
- The Shiwalik is the highest Himalayan range.
- All Himalayan regions have identical climate and vegetation.
Exam focus
- Revise range order and characteristics.
- Link Himalayas with monsoon, rivers and hazards.
- Remember Purvanchal as the eastern extension.
Concept 2
Northern Plains and Alluvial Belts
The Northern Plains are fertile depositional plains built by the Indus, Ganga and Brahmaputra river systems.
Step-by-step explanation
- The Northern Plains were formed by alluvial deposits brought by the Indus, Ganga, Brahmaputra and their tributaries.
- They are broad, flat and agriculturally productive, with dense population, irrigation, transport and urban settlements.
- Bhabar is a narrow coarse-pebble belt along the foothills where streams often disappear into porous deposits.
- Terai lies south of Bhabar, has finer deposits, re-emerging streams, high groundwater and historically dense forests or marshy conditions.
- Bhangar is older alluvium located above the active floodplain and may contain calcareous kankar nodules.
- Khadar is newer alluvium deposited in active floodplains and is renewed by periodic flooding, making it generally fertile but hazard-prone.
- The plains are divided broadly into Punjab, Ganga and Brahmaputra sections according to drainage and regional setting.
- Floods, riverbank erosion, waterlogging, groundwater stress and pollution require basin-level management despite high agricultural value.
Key points
- Alluvial Indus-Ganga-Brahmaputra plain
- Bhabar porous foothill belt
- Terai marshy re-emergence zone
- Bhangar older alluvium
- Khadar newer floodplain alluvium.
Worked examples
- Distinguishing Bhabar and Terai
- Comparing Bhangar and Khadar
Additional examples
- Distinguishing Bhabar and Terai
- Comparing Bhangar and Khadar
Important distinctions
- Bhangar is older and above active floodplain; Khadar is newer and renewed by floods.
- Bhabar absorbs streams; Terai receives their re-emergence and has higher moisture.
Common misconceptions
- Khadar is always less fertile because it floods.
- Bhabar and Terai are identical foothill belts.
Exam focus
- Draw the Bhabar-Terai-Bhangar-Khadar sequence.
- Link alluvium with fertility and flood risk.
- Revise three broad regional plain divisions.
Concept 3
Peninsular Plateau and the Ghats
The Peninsular Plateau is an ancient stable block with old rocks, mineral resources and dissected uplands.
Step-by-step explanation
- The Peninsular Plateau is composed largely of ancient crystalline rocks and is one of the oldest landmasses of the Indian subcontinent.
- The Central Highlands lie north of the Narmada and include the Malwa Plateau, Bundelkhand, Baghelkhand and associated uplands.
- The Deccan Plateau lies south of the Narmada and is bounded by the Western and Eastern Ghats and slopes broadly eastward.
- The Western Ghats are higher, more continuous and form an important watershed; they include the Sahyadri and receive heavy orographic rain on the west.
- The Eastern Ghats are discontinuous and dissected by rivers such as the Mahanadi, Godavari, Krishna and Kaveri.
- The plateau contains mineral resources, black-soil regions, forests, waterfalls, river valleys and major industrial locations.
- Peninsular rivers are generally older, more graded and more dependent on seasonal rainfall than Himalayan rivers, though major exceptions and dams exist.
- Plateau development must consider drought, soil erosion, mining, forest loss and water scarcity.
Key points
- Ancient crystalline stable block
- Central Highlands north of Narmada
- Deccan Plateau south of Narmada
- Western Ghats continuous watershed
- Eastern Ghats dissected by rivers.
Worked examples
- Comparing Western and Eastern Ghats
- Identifying a plateau resource or river pattern
Additional examples
- Comparing Western and Eastern Ghats
- Identifying a plateau resource or river pattern
Important distinctions
- Western Ghats are higher and continuous; Eastern Ghats are lower or discontinuous and river-dissected.
- Plateau rivers are generally older and seasonal; Himalayan rivers are younger, glacier or snow supported in headwaters and more perennial.
Common misconceptions
- The Eastern Ghats are more continuous and higher than the Western Ghats.
- All Peninsular Plateau rivers flow westward.
Exam focus
- Learn Central Highlands versus Deccan Plateau.
- Connect Ghats with watershed and rainfall.
- Revise plateau minerals, soils and river direction.
Concept 4
Indian Desert and Arid Landforms
The Indian Desert is a hot arid region shaped by low rainfall, high evaporation, wind action and seasonal drainage.
Step-by-step explanation
- The Indian Desert or Thar lies mainly west of the Aravalli range and extends across parts of Rajasthan and adjoining areas.
- Rainfall is low and highly variable, evaporation is high and temperatures show strong daily and seasonal ranges.
- Wind action forms sand dunes, including barchans and longitudinal dunes, while sparse vegetation protects soil only in patches.
- Luni is an important seasonal river that flows toward the Rann region and does not reach the sea as a perennial river.
- Inland drainage, salt lakes and playas occur where streams terminate in depressions or evaporate.
- Canal irrigation, groundwater, shelterbelts, solar power, livestock and tourism support desert livelihoods but create water-management challenges.
- The Aravalli orientation and monsoon wind direction help explain rainfall scarcity in western Rajasthan.
- Desertification results from climatic variability and human pressure such as overgrazing, vegetation loss, salinity and unsuitable irrigation.
Key points
- Thar west of Aravalli
- Low rainfall and high evaporation
- Sand dunes and wind action
- Luni seasonal drainage
- Canal irrigation and desertification issues.
Worked examples
- Explaining arid climate and dunes
- Identifying an inland-drainage feature
Additional examples
- Explaining arid climate and dunes
- Identifying an inland-drainage feature
Important distinctions
- Hot desert has high summer heat; cold desert areas such as Ladakh have low temperatures and different precipitation processes.
- Canal irrigation increases production but can also cause waterlogging and salinity.
Common misconceptions
- The Indian Desert has no rivers or agriculture at all.
- Every dune is formed by running water rather than wind.
Exam focus
- Revise Thar, Luni, dunes and inland drainage.
- Link aridity with evaporation and rainfall variability.
- Mention both irrigation benefits and salinity risks.
Concept 5
Coastal Plains and Island Groups
India's coastal and island divisions reflect marine processes, river deposition, coral formation and tectonic or volcanic activity.
Step-by-step explanation
- The Western Coastal Plain is generally narrow because the Western Ghats lie close to the Arabian Sea.
- It includes the Konkan, Kannad and Malabar coastal sections, with estuaries, lagoons, ports and varied fishing or plantation activity.
- The Eastern Coastal Plain is broader and more deltaic because large east-flowing rivers deposit sediment along the Bay of Bengal.
- Northern Circars and Coromandel Coast are broad eastern sections with deltas, lagoons, cyclones and important ports or agriculture.
- Andaman and Nicobar are a hilly, forested island group associated with a submerged mountain chain and tectonic activity.
- Barren Island is associated with India's active volcanic activity, while the islands also contain coral reefs and rich marine biodiversity.
- Lakshadweep consists mainly of low-lying coral islands and atolls with lagoons in the Arabian Sea.
- Coastal erosion, cyclones, storm surges, sea-level rise, coral bleaching and unplanned tourism threaten coastal and island environments.
Key points
- West coast narrow with estuaries and lagoons
- East coast broad and deltaic
- Andaman-Nicobar hilly and tectonic
- Lakshadweep coral atolls
- Cyclones and sea-level hazards.
Worked examples
- Comparing eastern and western coastal plains
- Distinguishing island origins
Additional examples
- Comparing eastern and western coastal plains
- Distinguishing island origins
Important distinctions
- Western coast is narrow and estuarine; eastern coast is broader and deltaic.
- Andaman-Nicobar are mainly tectonic or hilly; Lakshadweep is coral and low-lying.
Common misconceptions
- All Indian islands are volcanic.
- The eastern coast has no cyclone or delta hazard.
Exam focus
- Learn coast subdivisions and formation.
- Compare Andaman-Nicobar with Lakshadweep.
- Include coastal hazards in applied answers.
Concept 6
Physiography, Resources and Environmental Significance
Relief determines drainage, soil, resources, settlement, economy and natural hazards across India.
Step-by-step explanation
- Mountains provide water towers, forests, biodiversity, hydropower, tourism and strategic passes but are vulnerable to landslides and earthquakes.
- Plains provide fertile alluvium, dense settlement, transport corridors and irrigation but face floods, erosion, pollution and groundwater stress.
- Plateaus contain minerals, forests, waterfalls, black soils and industrial resources but face drought, mining impacts and soil erosion.
- Deserts support specialised pastoralism, irrigation agriculture, solar energy and tourism but are sensitive to water scarcity and desertification.
- Coasts support ports, fisheries, agriculture, industries and tourism but face cyclones, erosion, storm surges and salinity.
- Islands provide marine resources, biodiversity and strategic value but have limited land, freshwater and high disaster exposure.
- River direction and basin form influence dams, irrigation, deltas, estuaries, navigation and flood management.
- Planning must match infrastructure, settlements and resource use with carrying capacity and hazard zonation.
Key points
- Mountains - water, forests and hazards
- Plains - agriculture and floods
- Plateau - minerals and drought
- Desert - water scarcity and solar
- Coasts/islands - marine resources and cyclones.
Worked examples
- Linking relief division with economic activity
- Selecting a hazard-sensitive planning response
Additional examples
- Linking relief division with economic activity
- Selecting a hazard-sensitive planning response
Important distinctions
- Plains support dense agriculture and transport; mountains have lower accessibility but high water and ecological value.
- Coastal growth brings ports and markets but increases exposure to cyclones and sea-level change.
Common misconceptions
- Physiographic divisions are only landform labels with no economic significance.
- The same development model is suitable for every physical region.
Exam focus
- Use division-resource-hazard tables.
- Connect physical geography with human geography.
- Include sustainable, region-specific planning.