Prelims fact sheets
Delhi Ridge: Aravalli Extension, Location and Ecological Importance
The Delhi Ridge connects ancient Aravalli geology with today's urban conservation questions. Place it correctly, distinguish a ridge from a river plain and understand its ecological role.
Pragnya IAS Academy, Hyderabad · Updated 16 October 2026 · 5 min read
Locate the Ridge within India's physical geography
Trace the Aravalli system from Gujarat through Rajasthan and Haryana towards Delhi. The Ridge is the Delhi end of that system—not a Himalayan spur. Distinguish its rocky relief from the Yamuna floodplain: both are ecologically important, but their landforms, soils and hydrological settings differ.
| Feature | Remember |
|---|---|
| Parent hill system | Aravalli |
| Position | North-eastern extension into Delhi |
| Landscape | Rocky hill outcrops with forest and scrub habitats |
| Wildlife connection | Asola Bhatti Wildlife Sanctuary in the Southern Ridge landscape |
| Comparison | Not the Himalayan system; not the Yamuna alluvial floodplain |
Why is the Ridge called Delhi's green lungs?
The phrase describes the importance of vegetation and habitat in an intensely urbanised setting. Forest and scrub can support biodiversity, reduce erosion and help moderate the local environment. The Delhi Forest Department also highlights groundwater recharge. These benefits depend on soils, fractures, vegetation and land use: the phrase is not a precise pollution-removal measurement or proof that trees can replace emissions control.
Conservation issues: connectivity matters
- Construction and encroachment can fragment habitats and obstruct ecological connections.
- Restoration should consider native vegetation, soil conditions and long-term maintenance, not only the number of saplings planted.
- Urban planning must distinguish forests, ridge land, water bodies and floodplains rather than treating all open spaces as interchangeable.
- For legal status, notified boundaries and court orders, use the current official documents; the geological Ridge and any one protected-area boundary are not identical.
Original Prelims-style practice question
Consider the statements: (1) The Delhi Ridge is an extension of the Aravallis. (2) The Ridge is the same landform as the Yamuna floodplain. Which is correct? A: 1 only; B: 2 only; C: both; D: neither. Answer: A. The Ridge is a rocky hill-system extension, whereas the floodplain is an alluvial river landscape. This is original practice, not a UPSC previous-year question.
Related study notes and daily quiz
- Aravalli Range: state sequence, Guru Shikhar and ecology
- Study Library: mountains and physical relief
- Take the daily current-affairs quiz
Official references
Frequently asked questions
Which mountain range extends into Delhi?
The Aravalli system extends into Delhi as the Delhi Ridge.
Where does Asola Bhatti fit into the Ridge landscape?
The sanctuary is associated with the Southern Ridge and the north-eastern outliers of the Aravallis.
Is the Delhi Ridge the Yamuna floodplain?
No. The Ridge is rocky hill relief; the Yamuna floodplain is an alluvial river landscape.