The B.R Hill Sanctuary is also known as the Biligirirangaswamy Temple Hill Sanctuary (B.R. Hills). It is situated in the B.R. Hill range of Chamrajanagar district in Karnataka, bordering the state of Tamil Nadu. The sanctuary was created around the Biligirirangaswamy temple region in 1974, and covered an area of 322 sq km (square kilometers). It was enlarged to 539.52 sq km in 1987.

The sanctuary is at the confluence of the Western Ghats and the Eastern Ghats. It is thus home to ecosystems that are unique to both mountain ranges. To the south, the hills are contiguous with the Satyamangalam range in the Erode District of Tamil Nadu.

The B.R hills also link the Eastern Ghats and the Western Ghats, allowing animals to move between them. This linking facilitates gene flow between the populations of species in these areas. Thus, the sanctuary serves as an important biological bridge for the ecosystem of the entire Deccan plateau.

Tourists coming to the park should note that the nearest airport and the nearest railway station are both at Mysore, which is 85 km away. Another major city - Bangalore, is at a distance of 180 km from the park