The Biligirirangana Hills, commonly called BR Hills, is a hill range situated in south-eastern Karnataka, at its border with Tamil Nadu (Erode District) in South India. The area is called Biligiriranganatha Swamy Temple Wildlife Sanctuary or simply BRT Wildlife Sanctuary. It is a protected reserve under the Wildlife Protection Act of 1972. Being at the starting point of the Eastern Ghats and very close to Western Ghats, the sanctuary is home to eco-systems that are unique to both the mountain ranges. The site was declared a tiger reserve in January 2011 by the Karnataka government, a few months after approval from India's National Tiger Conservation Authority.