Haryana Proposes New Definition for Aravalli Hills: Impact on Real Estate and Environment
The Haryana government's new definition of the Aravalli hills could significantly reduce protected areas, favoring real estate and mining interests while threatening the region's ecology.
Aravalli HillsHaryanaReal EstateMiningConservationReal EstateOct 10, 2025
The Haryana government has proposed a new definition for the Aravalli hills using criteria of geological age and height of the feature, which, once notified, could significantly narrow the landscapes that qualify for legal conservation.
According to an October 4 letter from the Haryana Mines and Geology Department to the state Environment and Forests Department, only hills and ranges of the Aravalli Supergroup and Delhi Supergroup, which originated during the Palaeoproterozoic to Mesoproterozoic, and which rise higher than 100 metres (+5 metres) above the surrounding terrain, may be defined as ‘Aravalli Hills and Ranges’.
The Palaeoproterozoic Era spans from 2.5 to 1.6 billion years ago (gigaannum or Ga) and the Mesoproterozoic from 1.7-1 Ga. The proposed definition excludes all rocks and hills of the more recent Neoproterozoic Era (about 1 billion to 540 million years ago), and isolated landforms that are less than 100 metres tall, regardless of their environmental importance.
According to M D Sinha, a former Conservator of Forests (South Haryana), the 100-metre relief criterion will potentially erase most of the Gurgaon and Faridabad Aravallis from official maps, and deny these areas protections mandated by the Supreme Court. Since these areas mostly feature scrub hills and grasslands with only small patches of dense forest, almost all of the current ‘Aravalli hills’ outside of notified forest law zones could in effect be opened up for commercial real estate and mining, Sinha said.
The Mines and Geology Department’s justification for the change in definition is that it conforms to the Geological Survey of India’s (GSI’s) classification of the Aravalli Hills and Ranges, which includes only ancient, linear, continuous ranges composed of Aravalli Supergroup (Palaeoproterozoic) or Delhi Supergroup (Mesoproterozoic) rocks. The inclusion of rocks from other eras would dilute the geological identity of the Aravalli-Delhi fold belt, the letter states. The 100-metre height criterion has been taken from Rajasthan’s existing policy, it says.
Sinha, however, argued that this rationale is flawed, since the age and height of hills have no bearing on their ecological function – and many of India’s oldest mountain systems, including large portions of the Eastern Ghats, would fail the test of being continuous as they are ravaged by weather over time. He added that restricting protections to only these select patches could reduce Haryana’s natural forest cover to the lowest in the country.
Rajasthan’s policy aims are different, Sinha said – it seeks to demarcate mining areas, rather than to preserve forests. The Aravalli hills, even though they are scrubby and low, help conserve biodiversity, retain water, trap heat, and regulate climate for the wider Delhi-NCR area, Sinha said. Losing them will worsen dust pollution, water scarcity, and extreme weather, and impact millions of people in Delhi and adjoining regions, he said. “Only a handful of powerful landowners and companies would benefit from unlocking real estate value on unprotected hills,” Sinha said.
He also said that the new definition, if accepted, could set a precedent for other states and even Delhi, where nearly all existing ridge (forest) lands would vanish from conservation maps. According to Sinha, the “jargonistic sophistry” of the new definition will accelerate ecological damage in NCR and much of Haryana.
Earlier on August 18, the Haryana government had officially defined the “dictionary meaning of forest” for purposes of their conservation and protection in the state. The state’s Environment, Forest and Wildlife Department stated in a notification that “A patch of land shall be deemed to be ‘forest as per dictionary meaning’ if it…has a minimum area of five hectares, if it is in isolation, and a minimum area of two hectares, if it is in contiguity with the government notified forests, and [if] it has a canopy density of 0.4 (40%) or more”.
The notification said that “all linear/ compact/ agro-forestry plantations and orchards situated outside the government notified forests shall not be treated as forests under [this] definition”. Such linear plantations are frequently found along roads, canals, and railway tracks, where they can serve multiple purposes.
The new definition of forests, along with the proposed new definition of the Aravalli hills, can have very significant ecological implications, experts like Sinha believe. “This will worsen the NCR’s pollution problems considerably. One of the major issues in the NCR region has been because of the dryness of the area, the ambient dust load in the atmosphere is high. And if you increase it even higher, it will only lead to worse pollution. The morphological Aravalli has a very important role in overall climate mitigation in the entire NCR,” Sinha said.
Frequently Asked Questions
What is the proposed new definition of the Aravalli hills by the Haryana government?
The Haryana government proposes that only hills and ranges of the Aravalli Supergroup and Delhi Supergroup, which originated during the Palaeoproterozoic to Mesoproterozoic and rise higher than 100 metres above the surrounding terrain, may be defined as ‘Aravalli Hills and Ranges’.
How much of the Aravallis will be excluded by the new definition?
The 100-metre relief criterion will potentially erase most of the Gurgaon and Faridabad Aravallis from official maps, denying these areas protections mandated by the Supreme Court.
What is the Mines and Geology Department’s justification for the change in definition?
The department claims that the new definition conforms to the Geological Survey of India’s classification, which includes only ancient, linear, continuous ranges composed of Aravalli Supergroup (Palaeoproterozoic) or Delhi Supergroup (Mesoproterozoic) rocks.
What problems could the lifting of protections bring?
Losing the Aravalli hills will worsen dust pollution, water scarcity, and extreme weather, impacting millions of people in Delhi and adjoining regions. It will also benefit only a handful of powerful landowners and companies.
What is the Haryana government’s new definition of 'forest'?
A patch of land shall be deemed to be ‘forest as per dictionary meaning’ if it has a minimum area of five hectares, if it is in isolation, and a minimum area of two hectares, if it is in contiguity with the government notified forests, and if it has a canopy density of 0.4 (40%) or more.
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