India: Location, Extent, and Space Relationship

India, a country of ancient civilization, is the seventh-largest country in the world by area and the most populous. Its unique geographical position has given it a distinct identity as a "subcontinent."

1. Geographical Location and Extent

• Mainland Extent: The mainland of India extends between latitudes 8°4'N and 37°6'N and longitudes 68°7'E and 97°25'E.
• Extreme Points:
  • North: Indira Col (Siachen Glacier, Ladakh).
  • South (Mainland): Kanyakumari (Cape Comorin, Tamil Nadu).
  • South (Union): Indira Point (Great Nicobar Island) at 6°45'N.
  • West: Ghuar Mota/Sir Creek (Kutch, Gujarat).
  • East: Kibithu (Anjaw District, Arunachal Pradesh).
• Dimensions: From north to south, the distance is 3,214 km, and from east to west, it is 2,933 km.
• Tropic of Cancer (23°30'N): Divides India into a tropical south and a subtropical north. It passes through 8 states: Gujarat, Rajasthan, Madhya Pradesh, Chhattisgarh, Jharkhand, West Bengal, Tripura, and Mizoram.
• Standard Meridian (82°30'E): Passes through Mirzapur, UP. The Indian Standard Time (IST) is 5 hours 30 minutes ahead of GMT.

2. Size and Boundaries

• Area: Roughly 3.28 million sq km, accounting for 2.4% of the world's total area.
• Land Boundary: Approximately 15,200 km.
• Coastline: 7,516.6 km (including the mainland, Lakshadweep, and Andaman & Nicobar Islands).
• International Borders:
  • Bangladesh: 4,096 km (Longest).
  • China: 3,488 km (MacMahon Line in the East).
  • Pakistan: 3,323 km (Radcliffe Line).
  • Nepal: 1,751 km.
  • Myanmar: 1,643 km.
  • Bhutan: 699 km.
  • Afghanistan: 106 km (Shortest - in PoK).

3. Space Relationship with Neighbors

India occupies a central position in South Asia, acting as a bridge between East Asia and West Asia. Its location on the Indian Ocean allows it to control key Sea Lanes of Communication (SLOCs).

• SAARC Presence: India shares borders with most SAARC nations, making its role crucial for regional stability.
• Geopolitics: India's central location in the Indian Ocean provides a strategic advantage for trade and oceanic security (SAGAR initiative).

Detailed Physiographic Regions of India

1. The Northern and Northeastern Mountains (The Himalayas)

The Himalayas are tectonic (fold) mountains formed by the collision of the Indian and Eurasian plates. They are classified into three major parallel ranges:

A. The Trans-Himalayas

• Located north of the Great Himalayas.
• Major ranges: Karakoram, Ladakh, Zaskar, and Kailash.
• K2 (Mt. Godwin Austen): The highest peak in India (but in PoK) is located in the Karakoram range.

B. The Great Himalayas (Himadri)

• The highest and most continuous range, always snow-capped.
• Average height: 6000m.
• Famous peaks: Mt. Everest (Nepal), Kanchenjunga (Sikkim), Nanga Parbat, Nanda Devi.

C. The Lesser Himalayas (Himachal)

• Located south of the Great Himalayas.
• Altitude ranges from 3,700m to 4,500m.
• Important ranges: Pir Panjal (longest), Dhaola Dhar, Mahabharat.
• Houses famous hill stations: Shimla, Manali, Nainital, Mussoorie.

D. The Outer Himalayas (Shiwaliks)

• Southernmost range with an altitude of 900-1100m.
• Composed of unconsolidated sediments brought by rivers.
• Longitudinal valleys between Lesser Himalayas and Shiwaliks are called Duns (e.g., Dehradun).

E. Purvanchal Hills

• The Himalayas take a sharp southward bend beyond the Dihang gorge.
• Includes Patkai Bum, Naga Hills, Manipur Hills, and Mizo Hills.

2. The Northern Plains

Formed by the depositional work of the Indus, Ganga, and Brahmaputra rivers. It is the most fertile and densely populated region of India.

• Bhabar: Narrow belt where rivers disappear under pebbles.
• Terai: South of Bhabar, a swampy, marshy region with dense forests.
• Bhangar: Older alluvium, higher than the floodplains, contains Kankar (carbonates).
• Khadar: Younger alluvium, renewed annually by floods, very fertile.

3. The Peninsular Plateau

A tableland of old crystalline rocks (Gondwanaland part).

• Central Highlands: North of Narmada, includes Malwa and Chota Nagpur plateaus.
• Deccan Plateau: South of Narmada, triangular. Known for Deccan Trap (Black Soil).
• Western Ghats (Sahyadris): Continuous, higher elevation. Highest peak: Anamudi.
• Eastern Ghats: Discontinuous, lower elevation.

4. The Indian Desert (Thar Desert)

Located west of the Aravalli hills in Rajasthan. Characterized by low rainfall, arid climate, and sand dunes (Barchans).

5. The Coastal Plains

• Western Coastal Plain: Narrow, includes Konkan, Kannad, and Malabar coasts.
• Eastern Coastal Plain: Wider, includes Northern Circars and Coromandel coast.

6. The Islands

• Andaman & Nicobar: In Bay of Bengal, volcanic origin (extension of Arakan Yoma).
• Lakshadweep: In Arabian Sea, coral origin (atolls).