The Aravalli Ridge is the northern extension of the Aravalli Range into Delhi and adjoining parts of the National Capital Region. It is one of the most important ecological features of Delhi because it acts as the city’s natural green barrier, biodiversity zone and groundwater recharge landscape.
The Ridge is often called the green lungs of Delhi, but its importance is not only aesthetic. It protects Delhi from desertification pressure from the west, supports native scrub forest biodiversity and provides one of the few remaining natural habitats inside the capital.
Location and Structure
The Aravalli Ridge in Delhi is part of the ancient Aravalli mountain system, one of the oldest fold mountain ranges in the world.
In Delhi, the Ridge is commonly divided into four parts:
- Northern Ridge
- Central Ridge
- South-Central Ridge
- Southern Ridge
Important areas linked with the Ridge include:
- Delhi University North Campus region
- Kamla Nehru Ridge
- Jhandewalan and Buddha Jayanti Park area
- Sanjay Van
- Mehrauli-Aravalli landscape
- Asola-Bhatti Wildlife Sanctuary
The Southern Ridge is the largest and most ecologically significant part because it connects with the wider Aravalli landscape of Gurugram and Faridabad.
Ecological Importance
The Aravalli Ridge represents a dry thorn-scrub forest ecosystem, not a dense moist forest. Its native vegetation includes species adapted to Delhi’s semi-arid climate.
Important native species include:
- dhok
- babool
- khejri
- ber
- palash
- hingot
- dhau
- kareel
The Ridge supports several mammals, birds, reptiles and insects. It provides habitat for species such as nilgai, jackal, mongoose, porcupine, monitor lizard, peafowl, owls, raptors and many scrubland birds.
Its ecological role is especially important because Delhi has lost many natural habitats to urbanisation. The Ridge still provides:
- habitat for native scrubland species
- groundwater recharge through rocky terrain and open soil
- heat-island moderation
- dust and wind barrier
- ecological connectivity in the NCR
- carbon storage in urban green cover
The Ridge also supports bird diversity in Delhi, making it important for urban biodiversity studies such as the Delhi Bird Atlas.
Legal and Conservation Status
The Aravalli Ridge has received legal protection through court orders and government notifications because of intense urban pressure.
The Delhi Ridge is treated as a protected forest under different notifications, while parts of the southern Ridge fall under Asola-Bhatti Wildlife Sanctuary.
The Supreme Court and National Green Tribunal have repeatedly dealt with issues related to Aravalli conservation, mining, construction and encroachment.
The Ridge is important in Delhi’s Master Plan and environmental governance because it is one of the few remaining large natural landscapes in the city.
Specific Concerns
The Ridge faces pressure from urban expansion, roads, real estate, institutional construction, encroachment and invasive species.
A major ecological concern is the spread of Prosopis juliflora, locally called vilayati kikar. It was introduced for greening degraded land, but it has now spread widely and displaced native Aravalli vegetation in many areas.
Other concerns include:
- fragmentation of Ridge patches
- construction pressure
- dumping of waste and debris
- fire incidents in dry seasons
- loss of native scrub vegetation
- disturbance from roads and traffic
- poor ecological connectivity with Gurugram-Faridabad Aravallis
- groundwater stress in surrounding urban areas
The main issue is that the Ridge is often treated as ordinary green land. In reality, it is a specific dry scrub ecosystem, and planting random ornamental or non-native trees can damage its ecological character.
Conclusion
The Aravalli Ridge is Delhi’s most important natural ecological barrier and a remnant of the ancient Aravalli system.
Its importance lies in dry scrub biodiversity, groundwater recharge, heat moderation, bird habitat and protection against desertification pressure.The key conservation priority is not just increasing green cover, but restoring the Ridge with native Aravalli species, controlling invasive Prosopis juliflora and preventing further fragmentation of Delhi’s last major natural landscape.
