India: Location, Extent and Physical Divisions
India: Location, Extent and Physical Divisions
Indian geography gives about 12 of the Part-III Social Science questions and this topic opens it with 2 of them. Location and extent, the standard meridian and the six physical divisions together form the framework that every later Indian geography question rests on.
Location and Extent
| Item | Detail |
|---|---|
| Latitudinal extent | About 8 degrees 4 minutes N to 37 degrees 6 minutes N |
| Longitudinal extent | About 68 degrees 7 minutes E to 97 degrees 25 minutes E |
| Standard meridian | 82 degrees 30 minutes E, through Mirzapur |
| Area rank | Seventh largest country in the world |
| Land neighbours | Seven, including Pakistan, China, Nepal, Bhutan, Bangladesh, Myanmar, Afghanistan |
| Southernmost point of mainland | Kanyakumari |
The Tropic of Cancer passes almost through the middle of the country, crossing eight states: Gujarat, Rajasthan, Madhya Pradesh, Chhattisgarh, Jharkhand, West Bengal, Tripura and Mizoram.
Bihar is not among them. The line runs through Jharkhand, just to the south of the state. Bihar candidates assume otherwise more often than any other group, which is why the question is set.
✗ The Tropic of Cancer passes through Bihar | ✓ It crosses Jharkhand, immediately south of Bihar — not Bihar itself
The Six Physical Divisions
| Division | Feature |
|---|---|
| The Himalayas | Three parallel ranges: Himadri, Himachal, Shiwalik |
| Northern Plains | Built by Indus, Ganga and Brahmaputra deposits |
| Peninsular Plateau | Oldest landmass; rich in minerals |
| Indian Desert | The Thar, in western Rajasthan |
| Coastal Plains | Eastern and Western coasts |
| Islands | Andaman and Nicobar; Lakshadweep |
The Greater Himalaya or Himadri holds the highest peaks and is permanently snow-covered; Kangchenjunga is the highest peak within India. The Shiwaliks are the youngest and lowest range, and the longitudinal valleys between the Himachal and Shiwalik ranges are called Duns, of which Dehradun is the best known.
The Northern Plains and Bihar
The Northern Plains are formed entirely of alluvium brought down by three river systems, which is why they are level, deep-soiled and among the most fertile land in the world. Bihar lies wholly within them.
- Bhabar — the narrow porous belt at the Shiwalik foot, where streams disappear underground.
- Terai — the marshy belt below it, where they re-emerge; found along the Nepal border in north Bihar.
- Bhangar — older alluvium, above flood level, often with lime nodules called kankar.
- Khadar — newer alluvium in the flood plain, renewed each year and the most fertile.
The bhangar and khadar pair is asked directly and matters practically in Bihar: the annual flood that damages property is the same process that renews the khadar soil. That double effect is a point worth making in a classroom, because it explains why people continue to farm land that floods.
The Islands and Coasts
- The Andaman and Nicobar islands lie in the Bay of Bengal and are of volcanic and tectonic origin.
- Lakshadweep lies in the Arabian Sea and is of coral origin.
- The Western Coastal Plain is narrow, with estuaries; the Eastern Coastal Plain is wider, with deltas.
- India's mainland coastline runs along nine states and several union territories.
The coral against volcanic origin distinction between the two island groups is asked in almost every set on Indian geography, and it is the item candidates most often reverse.
कर्क रेखा बिहार से नहीं, झारखंड से गुजरती है।
TRE pointer: The Tropic of Cancer does not cross Bihar is the single most productive trap in Indian geography for a state candidate, and it is worth fixing before anything else. The bhangar and khadar pair matters twice, as a definition and as the explanation of why flooded land is still farmed. The Lakshadweep is coral, Andamans volcanic contrast is the third guaranteed item.
60-Second Recap
- India runs about 8 to 37 degrees North; standard meridian 82.5 East through Mirzapur.
- The Tropic of Cancer crosses eight states — Jharkhand, not Bihar.
- Six physical divisions; Kangchenjunga is the highest peak within India.
- Duns are the valleys between the Himachal and Shiwalik ranges.
- Bhabar, Terai, Bhangar and Khadar are the belts of the northern plains.
- Andaman and Nicobar are volcanic and tectonic; Lakshadweep is coral.
Frequently Asked Questions
Does the Tropic of Cancer pass through Bihar?
No. It crosses eight states: Gujarat, Rajasthan, Madhya Pradesh, Chhattisgarh, Jharkhand, West Bengal, Tripura and Mizoram. In this region it runs through Jharkhand, just south of Bihar. Bihar candidates assume otherwise more often than any other group.
What is the difference between bhangar and khadar?
Bhangar is older alluvium lying above the flood level, often containing lime nodules called kankar. Khadar is newer alluvium in the active flood plain, renewed by silt every year and therefore more fertile. Both belong to the northern plains.
How do the Andaman and Lakshadweep islands differ in origin?
The Andaman and Nicobar islands in the Bay of Bengal are of volcanic and tectonic origin, while Lakshadweep in the Arabian Sea is of coral origin. Candidates reverse this pairing regularly, so it is worth learning as a contrast rather than separately.
What are Duns?
Longitudinal valleys lying between the Himachal and Shiwalik ranges of the Himalayas, of which Dehradun is the best known. They are flat-floored and fertile, formed where rivers deposited material in the trough between the two ranges.