One-kilometre area surrounding the Mathikettan Shola National Park was declared as ESZ.
The notification was issued by the Union Ministry of Environment, Forest and Climate Change under the Environment Protection Act 1986.
Mathikettan Shola National Park is situated in the high ranges of southern Western Ghats in Kerala.
It is the last remnant of the original forests of the Cardamom Hill Reserve.
It shares an inter-state boundary with Kerala and Tamil Nadu.
The area earmarked for the construction of the Neutrino Observatory is in Theni.
It is the east side of Mathikettan Shola National Park.
This area will not be an ESZ.
Eco-Sensitive Zones (ESZ) or Ecologically Fragile Areas are areas within 10 kms around Protected Areas, National Parks and Wildlife Sanctuaries.
The purpose of declaring ESZs is to create some kind of "shock absorbers" to the protected areas by regulating and managing the activities around such areas.
They also act as a transition zone from areas of high protection to areas involving lesser protection.