Major Mountain Ranges of India: UPSC Notes

Did you know that nearly 13% of India's landmass is covered by mountains? These mountain ranges shape India's climate, give rise to major rivers, support rich biodiversity, influence agriculture, and act as natural barriers protecting the country's borders.

For UPSC aspirants, understanding the major mountain ranges of India is essential, as this topic is frequently tested in both the Prelims and Mains exam. Here, we will cover the major mountain ranges of India, their location, features, significance, and important facts.

A mountain range is a chain or group of connected mountains formed over millions of years through geological processes such as tectonic plate movements, volcanic activity, and erosion. Mountain ranges extend across large geographical areas and play a crucial role in shaping the physical and climatic features of a region.

Key Features of a Mountain Range

• Consists of a series of connected mountains with common geological characteristics.
• Formed mainly due to tectonic movements, volcanic activity, or long-term erosion.
• Influences climate by affecting rainfall and wind patterns.
• Acts as the source of many major rivers and glaciers.
• Supports rich biodiversity and unique ecosystems.
• Holds strategic, economic, and ecological importance for a country.

Example

The Himalayan Mountain Range is the most prominent mountain range in India. Stretching across India, Nepal, Bhutan, China, and Pakistan, it is the world's highest mountain system and is the source of several major rivers, including the Ganga, Indus, and Brahmaputra.

Before studying each mountain range in detail, it is helpful to know where they are located.

The Himalayas are young fold mountains, formed millions of years ago due to the collision of the Indian and Eurasian tectonic plates. They are one of the most geologically active mountain ranges in the world.

Geographical Extent

The Himalayas extend from the Indus Valley in the west to the Brahmaputra River in the east, covering the northern states of Jammu & Kashmir, Himachal Pradesh, Uttarakhand, Sikkim, and Arunachal Pradesh. They also continue into Nepal, Bhutan, and Tibet, forming a natural boundary between the Indian subcontinent and the Tibetan Plateau.

Three Major Divisions of the Himalayas

The Himalayas are divided into three parallel ranges, each with distinct characteristics:

1. Greater Himalayas (Himadri)

• The highest and most continuous range.
• Home to some of the world’s highest peaks, including Mount Everest (8,849 m) and Kanchenjunga (8,586 m).
• Covered with permanent glaciers and a source of major rivers like the Ganga, Yamuna, and Brahmaputra.

2. Lesser Himalayas (Himachal)

• Lies between the Greater Himalayas and the Shivaliks.
• Contains famous hill stations such as Shimla, Mussoorie, and Darjeeling.
• Rich in forests, pastures, and river valleys that support agriculture and tourism.

3. Shivalik Hills

• The outermost and lowest range of the Himalayas.
• Characterised by small hills and valleys with alluvial deposits.
• Home to the Dun valleys like Dehradun and Patli Dun, known for fertile soil and settlements.

Significance of the Himalayas

• Acts as a climatic divide, preventing cold winds from Central Asia from entering India.
• Responsible for monsoonal rainfall, as they trap moisture-laden winds from the Indian Ocean.
  Serves as a natural defence for India against invasions from the north.
• Several important military posts are located in the Himalayas, especially along the Indo-China and Indo-Pak borders.
• Support agriculture, hydroelectric power, and drinking water for millions in the subcontinent.

The Karakoram Range is one of the most formidable mountain ranges in the world. It is known for its rugged terrain, extreme climatic conditions, and strategic importance.

Geographical Extent

The Karakoram Range is located in the northernmost region of India, primarily in Ladakh (Jammu & Kashmir).  It stretches across India, Pakistan, and China, forming a natural boundary between these nations. 

Features of the Karakoram Range

• The Karakoram Range is home to K2 (8,611 meters), the second-highest peak in the world after Mount Everest.
• The Siachen Glacier, located in the Karakoram, is the highest battlefield in the world.
• The region is crucial for India’s defence strategy, given its proximity to the Line of Control (LoC) with Pakistan and the Line of Actual Control (LAC) with China.
• The Karakoram Highway, one of the highest paved roads in the world, connects Pakistan to China through the Gilgit-Baltistan region.
• The area is geopolitically sensitive due to the China-Pakistan Economic Corridor (CPEC), which passes through the disputed Gilgit-Baltistan region.
• The harsh climate and high-altitude terrain make human habitation difficult.
• Glacial melting in the Karakoram is a concern due to climate change, impacting water sources and increasing the risk of landslides.

The Purvanchal Range, also known as the Eastern Mountains, is an important extension of the Himalayan mountain system in Northeast India. The Purvanchal Range is an extension of the Himalayas, curving southward after the Dihang Valley in Arunachal Pradesh. 

Geographical Extent & Major Hills

The Purvanchal Range covers the northeastern states of Nagaland, Manipur, Mizoram, Assam, Tripura, and Arunachal Pradesh. The Purvanchal hills are lower in elevation, heavily forested, and covered with deep valleys. The range comprises several hill groups, including:

1. Patkai Hills

• Located in Arunachal Pradesh, Nagaland, and Assam.
• Acts as a natural boundary between India and Myanmar.
• Covered with dense rainforests, home to a variety of flora and fauna.

2. Naga Hills

• Spread across Nagaland and Arunachal Pradesh, extending into Myanmar.
• Kohima, the capital of Nagaland, is situated in this range.
• Known for its cultural and ethnic diversity, housing the Naga tribes.

3. Mizo Hills (Lushai Hills)

• Found in Mizoram, forming its dominant geographical feature.
• Phawngpui (Blue Mountain), the highest peak of Mizoram, is part of this range.
• Rich in biodiversity, with unique species of orchids and medicinal plants.

Significance of the Purvanchal Range

• The Purvanchal region is part of the Indo-Burma Biodiversity Hotspot, one of the most ecologically rich regions in the world.
• The forests support rare and endangered species like the Hoolock Gibbon, Clouded Leopard, and Red Panda.
• The region is home to several national parks and wildlife sanctuaries, including Namdapha National Park (Arunachal Pradesh) and Dampa Tiger Reserve (Mizoram).
• The high rainfall contributes to lush green forests, rivers, and fertile lands, making the region ideal for agriculture and tea plantations.
• The tribal communities of Northeast India, including the Nagas, Mizos, and Chakmas, have distinct cultural traditions deeply linked to the hills.
• The range forms India’s eastern frontier with Myanmar, making it strategically important for defence and trade.

The Aravalli Range is one of the oldest fold mountains in the world. Despite their modest height, the Aravallis play a vital role in climate regulation, biodiversity, and India's historical and cultural heritage.

Geographical Extent & Key Features

The Aravalli Range extends approximately 800 km from Gujarat in the southwest to Haryana in the northeast, passing through Rajasthan and Delhi. Some of its notable features include:

• Highest Peak: Guru Shikhar (1,722 meters) in Mount Abu, Rajasthan.
• Oldest Fold Mountains: Formed over 2.5 billion years ago during the Precambrian era, making them one of the oldest mountain ranges in the world.
• Low Elevation & Erosion: Due to continuous weathering over millions of years, the range is low in height and consists of rocky hills and ridges.

Significance of the Aravalli Range

1. Natural Barrier to the Thar Desert

• The Aravalli Range acts as a climatic divide, preventing the eastward expansion of the Thar Desert.
• The forests in the Aravallis trap monsoon moisture, helping in rainfall distribution across Rajasthan and adjoining regions.

2. Rich in Mineral Resources

• The range is abundant in minerals like marble, granite, zinc, copper, and lead, supporting Rajasthan’s mining industry.
• Rajasthan’s famous marble industry, including the Makrana marble used in the Taj Mahal, originates from the Aravallis.

3. Ecological Importance & Biodiversity

• The Aravalli hills support semi-arid forests, grasslands, and wildlife, including leopards, sloth bears, and antelopes.
• Important wildlife reserves like Sariska Tiger Reserve and Ranthambore National Park are located in the Aravalli region.
• Delhi Ridge, the northeastern extension of the Aravallis, acts as the green lung of Delhi, reducing pollution levels.

4. Historical & Cultural Significance

• The Aravallis have witnessed the rise and fall of many ancient civilisations, including the Indus Valley Civilisation, which flourished along its foothills.
• The range is home to historical forts and temples, such as Kumbhalgarh Fort, Chittorgarh Fort, and Ranakpur Jain Temple.
• Mount Abu, Rajasthan’s only hill station, is a popular tourist and pilgrimage destination, known for the Dilwara Jain Temples.

The Western Ghats, also known as the Sahyadri Hills, are a mountain range running parallel to the western coast of India. The Western Ghats play a crucial role in shaping the monsoon patterns and are home to numerous endemic species.

Geographical Extent & Key Features

The Western Ghats extend for approximately 1,600 km from the Tapti River in Maharashtra to Kanyakumari in Tamil Nadu, covering the states of Maharashtra, Goa, Karnataka, Kerala, and Tamil Nadu.

• Anamudi (2,695 meters) is the highest peak, located in Kerala.
• Steep on the western side and gradual slopes on the eastern side, affecting climate and river patterns.
• Acts as a climatic divide, preventing the southwest monsoon from reaching the Deccan Plateau.

Significance of the Western Ghats

• The Western Ghats intercept the southwest monsoon winds, causing orographic rainfall, making the windward side lush and fertile.
• Major rivers like Godavari, Krishna, and Kaveri originate from the Western Ghats, supplying water to peninsular India.
• The Western Ghats are one of the eight “hottest” biodiversity hotspots in the world.
• Home to key species, including the Malabar civet, Nilgiri tahr, and lion-tailed macaque.
• Houses numerous national parks, wildlife sanctuaries, and biosphere reserves, such as Silent Valley National Park, Periyar Wildlife Sanctuary, and Kudremukh National Park.
• The region is known for plantation agriculture, growing crops like tea, coffee, spices (cardamom, pepper, cloves), and rubber.

Must read: Western Ghats of India: UPSC Notes

The Eastern Ghats are a scattered and discontinuous mountain range running along the eastern coast of India. Unlike the Western Ghats, which are continuous and steep, the Eastern Ghats are broken and fragmented, with several low-elevation hills separated by rivers.

Geographical Extent & Key Features

• Stretch from the Mahanadi River in Odisha to the Vaigai River in Tamil Nadu.
• Cover the states of Odisha, Andhra Pradesh, Telangana, Karnataka, and Tamil Nadu.
• The highest peak in the Eastern Ghats is Arma Konda (1,680 meters) in Andhra Pradesh.

Significance of the Eastern Ghats

• Acts as a watershed for several east-flowing rivers, which drain into the Bay of Bengal.
• Rivers such as Mahanadi, Godavari, Krishna, and Kaveri cut through the range, forming fertile alluvial plains.
• Home to numerous endemic and endangered species, making it an important ecological zone.
• Hosts significant wildlife sanctuaries and national parks, such as Simlipal National Park (Odisha) and Papikonda National Park (Andhra Pradesh), which are known for their riverine ecosystem.
• Seshachalam Biosphere Reserve (Andhra Pradesh) is rich in medicinal plants.

The Eastern Ghats house some of India’s most famous pilgrimage sites, including:

1. Tirumala Hills (Tirupati Balaji Temple)
2. Araku Valley (Andhra Pradesh)
3. Mahendragiri Hills (Odisha)

Rivers originating in the Eastern Ghats power several dams and reservoirs, such as the Nagarjuna Sagar Dam on the Krishna River.

The Satpura Range, located in Central India, stretches across Madhya Pradesh, Maharashtra, and Chhattisgarh. This range plays a crucial role in biodiversity conservation, river systems, and climatic influence in central India.

Geographical Extent & Key Features

• Extends from Gujarat in the west to Chhattisgarh in the east.
• Lies south of the Narmada River, acting as a water divide between north and south India.
• The highest peak in the range is Dhupgarh (1,350 meters) in Madhya Pradesh.
• Major plateaus like the Malwa Plateau and the Deccan Plateau originate from this range.

Significance of the Satpura Range

• The Satpura forests are among the richest biodiversity zones in India.
• Home to several national parks and wildlife sanctuaries, including Satpura National Park, Pench National Park, and Melghat Tiger Reserve.
• The Satpura Range serves as a watershed, giving rise to important rivers such as the Tapti River, Narmada River, and Son River.
• Acts as a barrier to the monsoon winds, influencing rainfall distribution.
• The dense vegetation helps in carbon sequestration, reducing the impact of climate change.
• Maintains soil moisture and prevents desertification in neighbouring regions.
• Mineral-rich region, with reserves of coal, manganese, and bauxite.
• Tourist destinations such as Pachmarhi (Madhya Pradesh) and Chikhaldara (Maharashtra) are popular hill stations.

"The mountains are the beginning and the end of all natural scenery." — John Ruskin

The major mountain ranges of India are much more than geographical features—they shape the country's climate, rivers, biodiversity, and strategic landscape. For UPSC aspirants, understanding their location, characteristics, and significance is essential for mastering Indian Geography. Regular map practice and concept-based revision will help you tackle both Prelims and Mains questions with confidence.