India's Diverse Physical Features

The Great Northern Mountains

The most prominent physical feature of India is the vast Himalayan mountain range, guarding the country's northern border. These are young, geologically active fold mountains that stretch in an arc from the Indus River in the west to the Brahmaputra River in the east.

The Himalayas consist of three main parallel ranges, which can be distinguished by their elevation and features.

1. The Great Himalayas (Himadri): This is the northernmost and highest range, with an average elevation of about 6,000 meters. It contains some of the world's highest peaks, including Kanchenjunga in India. This range is perpetually covered in snow, and it is the source of major rivers like the Ganga and Yamuna.
2. The Lesser Himalayas (Himachal): Located south of the Himadri, this range has an average altitude between 3,700 and 4,500 meters. It is known for its beautiful valleys, such as the Kashmir, Kangra, and Kullu valleys, and famous hill stations like Shimla and Mussoorie. Important ranges like the Pir Panjal and Dhauladhar are part of the Lesser Himalayas.
3. The Outer Himalayas (Shivaliks): This is the southernmost range, acting as the foothills of the Himalayas. Its altitude varies between 900 and 1,100 meters. The valleys lying between the Lesser Himalayas and the Shivaliks are known as 'Duns', with Dehradun being a well-known example.

Beyond these, there are the Trans-Himalayan ranges to the north of the Himadri (like the Karakoram, home to K2) and the Purvanchal hills in the northeast.

For a detailed, exam-focused summary of India's mountains, please read the following section from the provided Geography Notes.

The Northern Plains

Stretching south of the Himalayas lies the vast and fertile Northern Plain. This plain was formed by the deposition of alluvial soil brought down by three major river systems: the Indus, the Ganga, and the Brahmaputra. It is one of the most densely populated and agriculturally productive regions in the world.

Based on relief features, the Northern Plains are divided from north to south into four distinct zones:

• Bhabar: A narrow belt of pebbles and gravel, about 8-16 km wide, lying at the foot of the Shivaliks. Rivers descending from the mountains often disappear into this porous zone.
• Terai: Located south of the Bhabar, this is a marshy and swampy region where the streams that disappeared in the Bhabar reappear. It is characterized by dense forests and abundant wildlife.
• Bhangar: This is the largest part of the Northern Plain, composed of older alluvium. It lies above the floodplains and has a terrace-like feature. The soil contains calcareous deposits known locally as 'kankar'.
• Khadar: This zone consists of newer, younger alluvium deposited by rivers in their floodplains. The soil is renewed almost every year, making this region extremely fertile and ideal for intensive agriculture.

To get a clearer understanding of these divisions, refer to the following text.

The Peninsular Plateau

The Peninsular Plateau is an ancient tableland composed of old crystalline, igneous, and metamorphic rocks. It is roughly triangular in shape and lies south of the Northern Plains. The Narmada river divides the plateau into two broad sections:

1. The Central Highlands: This part lies to the north of the Narmada river. It includes the Malwa Plateau and the Chota Nagpur Plateau, which is a rich storehouse of minerals like coal and iron ore.
2. The Deccan Plateau: This is a triangular landmass that lies to the south of the Narmada river. It is bordered by the Western Ghats on the west and the Eastern Ghats on the east. The Western Ghats are continuous and higher than the discontinuous and eroded Eastern Ghats. The Deccan Plateau itself is the largest plateau in India.

For a summary of these plateaus, please review the specified section in your notes.

The Indian River Systems

India's rivers are the country's lifelines and can be classified into two major groups: the Himalayan Rivers and the Peninsular Rivers.

To cover this extensive topic efficiently, we will use a comprehensive video that provides a quick but thorough revision.

Watching these segments will give you a solid foundation on India's river systems. You can always refer back to the "RIVERS OF INDIA" section (pages 11-12) in the Adda247 PDF (LINK) for a quick textual recap of the facts.

Conclusion

In this lesson, we have surveyed the four cornerstones of India's physical geography. You've learned about:

• The Himalayan Mountains: Their three parallel ranges (Himadri, Himachal, Shivaliks) and their significance as the source of major rivers.
• The Northern Plains: Their formation from alluvial deposits and their division into Bhabar, Terai, Bhangar, and Khadar.
• The Peninsular Plateau: Its ancient origins and its division into the Central Highlands and the Deccan Plateau, bordered by the Ghats.
• The Indian River Systems: The classification into Himalayan and Peninsular rivers, with a detailed look at the major systems like the Ganga, Brahmaputra, Godavari, and Narmada.

These features are interconnected and collectively shape the country's landscape, climate, and culture. A firm grasp of this topic is a significant step forward in your General Knowledge preparation for the SSC CGL.

In the next lesson, we will build upon this foundation to explore "Indian climate patterns, monsoon mechanism, and seasons," examining how these physical features influence India's weather.