The Peninsular Plateau is India’s oldest and most stable landmass, composed of ancient Precambrian rocks dating back over 570 million years. Covering roughly 16 lakh sq km, it forms the core of the Indian subcontinent south of the Indo-Gangetic Plain. For UPSC, understanding its physiographic divisions, geological history, mineral wealth, and drainage patterns is essential — the topic connects physical geography, economic geography, and environmental studies.
Overview and Formation
The Peninsular Plateau is a remnant of the ancient Gondwanaland supercontinent. It separated from the southern landmass and drifted northward, eventually colliding with the Eurasian Plate — a collision that formed the Himalayas while the plateau itself remained largely stable.
Key Characteristics
| Feature | Detail |
|---|---|
| Age | Precambrian (over 570 million years) |
| Rock Type | Primarily igneous and metamorphic (gneiss, granite, schist) |
| Average Elevation | 600-900 metres |
| General Slope | West to east |
| Highest Point | Anaimudi (2,695 m) in the Anamalai Hills, Kerala |
| Area | ~16 lakh sq km |
| Stability | One of the most stable landmasses on Earth; minimal seismic activity |
The plateau's general slope from west to east explains why most peninsular rivers — Godavari, Krishna, Cauvery, Mahanadi — flow eastward into the Bay of Bengal.
Physiographic Divisions
The Peninsular Plateau is divided into several distinct sub-regions based on geology, relief, and drainage.
The Deccan Plateau
The Deccan Plateau forms the largest division of the Peninsular Plateau. Bounded by the Western Ghats on the west, the Eastern Ghats on the east, and the Satpura-Vindhya ranges on the north, it's a triangular tableland tilting from west to east.
Sub-divisions of the Deccan:
- Maharashtra Plateau — covered by Deccan Trap basalt (lava flows from the late Cretaceous period); black (regur) soil
- Karnataka Plateau — granitic and gneissic terrain; includes the Malnad (hill region) and Maidan (plain region)
- Telangana Plateau — transitional between the Deccan and coastal plains; undulating terrain
The Central Highlands
Located north of the Narmada River, the Central Highlands are bounded by the Aravalli Range to the west and merge into the Indo-Gangetic Plain to the north.
Key features:
- Malwa Plateau — between the Vindhyas and the Aravallis; black soil; formed of lava flows and sandstone
- Bundelkhand Plateau — granitic terrain; drought-prone; Betwa and Ken rivers flow through
- Chotanagpur Plateau — Jharkhand; rich in minerals (coal, iron, copper); Damodar and Subarnarekha rivers
The Aravalli Range
The Aravallis are the oldest fold mountains in India, stretching about 800 km from Delhi to Gujarat. Mount Abu's Guru Shikhar (1,722 m) is the highest peak. Once towering mountains, they've been eroded to remnant hills. The Aravallis act as a watershed between the Indus and Ganga drainage systems.
The Vindhya Range
The Vindhyas run east-west across central India, forming a traditional boundary between North and South India. Composed primarily of sandstone, they rise to about 300-600 metres. The Narmada-Son rift valley lies between the Vindhyas and Satpuras.
The Satpura Range
Running parallel to and south of the Vindhyas, the Satpura Range includes:
- Dhupgarh (1,350 m) in Pachmarhi — highest point and a hill station in Madhya Pradesh
- Mahadev Hills — eastern extension
- Rajpipla Hills — western extension into Gujarat
The Narmada River flows in the rift valley between the Vindhyas and Satpuras.
Western Ghats and Eastern Ghats
Western Ghats (Sahyadris)
The Western Ghats run for about 1,600 km from the Tapi River valley to Kanyakumari. They’re higher, more continuous, and ecologically richer than the Eastern Ghats. Recognised as a UNESCO World Heritage Site (2012) for their exceptional biodiversity.
| Feature | Detail |
|---|---|
| Length | ~1,600 km |
| Average Elevation | 900-1,600 m |
| Highest Peak | Anaimudi (2,695 m) |
| Notable Peaks | Dodda Betta (2,637 m), Mullayanagiri (1,930 m) |
| Passes (Gaps) | Thal Ghat (Mumbai-Nashik), Bhor Ghat (Mumbai-Pune), Pal Ghat (Kerala-Tamil Nadu) |
| Rainfall Effect | Causes orographic rainfall on windward (western) side; rain shadow on eastern side |
| Biodiversity | One of the world's 36 biodiversity hotspots |
The Western Ghats are the source of all major peninsular rivers flowing eastward — Godavari, Krishna, Cauvery, Tungabhadra, and others.
Eastern Ghats
The Eastern Ghats are discontinuous, broken by river valleys. They run from Odisha to Tamil Nadu and are generally lower than the Western Ghats.
| Feature | Detail |
|---|---|
| Continuity | Broken by Godavari, Krishna, Cauvery, and Mahanadi valleys |
| Average Elevation | 600-900 m |
| Highest Peak | Mahendragiri (1,501 m) in Odisha |
| Notable Hills | Nallamala, Javadi, Shevaroy, Palkonda |
| Merged Area | Converge with Western Ghats at the Nilgiri Hills |
Geological History
The Peninsular Plateau's geological timeline reveals some of India's most significant Earth science events.
Major Geological Events
| Period | Event | Significance |
|---|---|---|
| Archaean (>2,500 Ma) | Formation of granitic-gneissic complex | Foundation rock of the peninsula |
| Proterozoic (2,500-570 Ma) | Cuddapah and Vindhyan sedimentary systems | Limestone, sandstone, shale deposits |
| Carboniferous (359-299 Ma) | Gondwana sediment deposition | India's major coal deposits formed |
| Late Cretaceous (~66 Ma) | Deccan Trap volcanic eruptions | Massive basalt lava flows covering western/central India |
| Eocene onwards | Weathering and erosion | Laterite formation; current landscape |
The Deccan Traps are one of the largest volcanic provinces on Earth. Lava flows covered approximately 500,000 sq km, creating the flat-topped, step-like landscape of the Deccan. Some scientists link these eruptions to the mass extinction event that killed the dinosaurs.
Mineral Resources of the Peninsular Plateau
The ancient crystalline rocks of the plateau make it India's mineral heartland. The Chotanagpur Plateau and the Deccan Plateau together account for the majority of India's mineral wealth.
Mineral Distribution
| Region | Key Minerals | States |
|---|---|---|
| Chotanagpur Plateau | Coal, iron ore, copper, mica, bauxite, uranium | Jharkhand, Odisha, West Bengal |
| Odisha Highlands | Iron ore, manganese, chromite, bauxite | Odisha |
| Bellary-Hospet Region | Iron ore | Karnataka |
| Bailadila Hills | Iron ore | Chhattisgarh |
| Malwa Plateau | Limestone, sandstone | Madhya Pradesh |
| Maharashtra Plateau | Manganese, bauxite | Maharashtra |
| Kolar-Hutti | Gold | Karnataka |
| Singhbhum | Copper, iron, uranium | Jharkhand |
The Singhbhum-Keonjhar-Bonai belt is one of the richest mineral zones in Asia, containing iron ore, manganese, chromite, and copper in close proximity.
Related: Minerals & Energy Resources of India
Drainage Patterns
The plateau's drainage is divided by the Western Ghats:
East-flowing rivers (into Bay of Bengal):
- Mahanadi, Godavari, Krishna, Cauvery, Pennar, Subarnarekha
West-flowing rivers (into Arabian Sea):
- Narmada and Tapi (flow through rift valleys — not over the plateau surface)
- Sharavathi, Mandovi, Zuari (short, swift rivers)
The Narmada and Tapi are exceptions to the general eastward drainage — they flow through tectonic rift valleys (graben) rather than over the tilted plateau surface.
Related: River Systems of India: Himalayan & Peninsular
Soil Types
| Soil Type | Region | Parent Rock | Key Feature |
|---|---|---|---|
| Black (Regur) Soil | Maharashtra, MP, Gujarat, Karnataka | Deccan Trap basalt | Self-ploughing; moisture-retentive; cotton cultivation |
| Red Soil | Eastern Deccan, Odisha, Jharkhand | Crystalline igneous rocks | Iron-rich; acidic; needs fertiliser |
| Laterite Soil | Western Ghats, Odisha, Kerala | Intense weathering of rocks | Iron-aluminium-rich; poor fertility |
| Forest Soil | Hilly areas | Varied | Acidic; rich in humus at higher elevations |
Frequently Asked Questions
What is the difference between the Peninsular Plateau and the Deccan Plateau?
The Peninsular Plateau is the entire ancient landmass of peninsular India, including the Central Highlands, Aravallis, and the Deccan. The Deccan Plateau is a sub-division — the triangular tableland between the Western Ghats, Eastern Ghats, and the Satpura-Vindhya system. The Deccan is part of the Peninsular Plateau, not a separate entity.
Why do most peninsular rivers flow eastward?
The Peninsular Plateau tilts from west to east. The Western Ghats, located close to the western coast, form the main watershed. Rivers originating on the western slope of the Ghats flow eastward across the gentle gradient to drain into the Bay of Bengal. Only the Narmada and Tapi flow westward through rift valleys.
What are the Deccan Traps?
The Deccan Traps are massive basalt lava flows that erupted approximately 66 million years ago, covering about 500,000 sq km of western and central India. The term "trap" comes from the Swedish word for stairs, referring to the step-like landscape. These volcanic rocks weathered to form the nutrient-rich black (regur) soil.
Why is the Chotanagpur Plateau called the 'Ruhr of India'?
The Chotanagpur Plateau in Jharkhand is called the Ruhr of India (after Germany's industrial region) because of its extraordinary concentration of mineral resources — coal (Jharia, Bokaro), iron ore (Singhbhum), copper, mica, uranium, and bauxite. This mineral wealth supports heavy industries including steel plants at Jamshedpur and Bokaro.
Which is the highest point of the Peninsular Plateau?
Anaimudi at 2,695 metres, located in the Anamalai Hills of Kerala, is the highest point of the Peninsular Plateau and the highest peak in India south of the Himalayas. It lies at the junction of the Western Ghats and the Cardamom Hills. Dodda Betta (2,637 m) in the Nilgiris is the second highest.
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