India’s Oldest Mountain Range Is Being Redefined Out of Existence: The Aravalli Verdict Explained
The Aravalli range is older than the Himalayas, older than the Indian subcontinent as we know it, and older than human civilisation itself. Stretching from Delhi to Gujarat, these hills quietly perform one of India’s most critical ecological roles: stopping the Thar Desert from advancing eastward, regulating monsoon patterns, and sustaining groundwater systems across North-West India.
On November 20, 2025, a Supreme Court ruling fundamentally altered how the Aravalli range is legally defined. By accepting a new elevation-based criterion, the judgment effectively removes legal protection from nearly 90 percent of the hills that make up the Aravallis.
This article explains what the ruling says, why it matters, and why it has triggered nationwide concern among scientists, environmentalists, and local communities.
Prefer a faster, narrative-driven read?
Read the companion piece: Why the Aravalli Verdict Feels Like a Quiet Environmental Unravelling
What Did the Supreme Court Decide?
The Supreme Court accepted a definition proposed by the Central Empowered Committee that classifies only those hills rising more than 100 meters above surrounding terrain as part of the Aravalli range.
Under this definition:
* Hills below 100 meters are no longer legally considered part of the Aravallis
* These areas lose forest and environmental protections
* Mining and development restrictions no longer apply to them
According to Forest Survey of India data, out of more than 12,000 mapped hill features in the Aravalli region, only about 1,048 exceed 100 meters. The rest — nearly 90 percent — are now excluded.
Why This Ruling Has Triggered Alarm
The Aravallis do not function like young, steep mountain ranges. Their ecological value lies precisely in their low height and wide spread.
Scientists and environmental experts point out that:
* Even small hills act as wind barriers against desert dust
* Shallow slopes help recharge aquifers
* Vegetation cover stabilises fragile soil systems
* Low hills influence monsoon wind movement
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Removing protection based on height ignores how ancient ranges work.
Illegal Mining and Desertification Risks
The Aravalli region is rich in limestone, marble, zinc, and copper. Illegal mining has already flattened dozens of hills over the past few decades.
Between 1975 and 2019:
* Roughly 8 percent of the Aravalli range disappeared
* Over 3.6 lakh hectares in Haryana turned semi-arid
* Dust pollution worsened across NCR
Experts warn that removing legal protection will accelerate this trend.
Public Reaction and Political Response
The ruling triggered the #SaveAravalli movement across social media and ground protests in Rajasthan and Haryana.
Environmentalists, former chief ministers, scientists, and activists have criticised the decision, warning it could:
* Increase desertification
* Disrupt river systems like Chambal, Sabarmati, and Luni
* Worsen air pollution in Delhi-NCR
Notably, there has been little public defence of the ruling from environmental experts.
Global Comparisons: What Happens When Low Hills Lose Protection?
International examples show a clear pattern.
Regions that weakened protection for low-elevation hills often saw:
* Accelerated desertification (Pilbara, Australia)
* Water contamination (Appalachian foothills, USA)
* Irreversible ecological loss
Rare cases where damage was limited relied on advanced technology, strict enforcement, and strong rehabilitation — conditions that currently do not exist at scale in the Aravalli region.
What Happens Next?
Petitions, representations, and public pressure are mounting for judicial review. Whether the Supreme Court revisits the definition remains to be seen.
What is clear is this: redefining ancient ecosystems using modern, simplified metrics carries irreversible consequences.
? Context: What Is the Aravalli Range and Why It Matters
The Aravalli range is one of the oldest geological formations on Earth, predating the Himalayas by billions of years.
Key Functions of the Aravallis
* Acts as a natural barrier preventing the Thar Desert from expanding eastward
* Regulates monsoon wind flow
* Recharges groundwater aquifers
* Supports rivers like Chambal, Sabarmati, and Luni
* Stabilises fragile soil systems in Rajasthan, Haryana, and Gujarat
Why Height-Based Definitions Fail
Ancient ranges erode over time. Their ecological value lies in spread, continuity, and interaction with climate — not height.
Removing protection from low hills disrupts air quality, water security, agriculture, and climate resilience. This is why scientists oppose the 100-meter criterion.
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