Hill Range
The BR hills links the Eastern Ghats and the Western Ghats allowing animals to move between them and facilitating gene flow between populations of species in these areas. Thus, this sanctuary serves as an important biological bridge for the biota of the entire Deccan plateau.
The BR hills along with the Male-Mahadeshwara (MM Hills) range forms a distinctly unusual ridge running north-south amidst the plains of Bangalore (~900 m above MSL), Mysore(~800 m above MSL) and Krishnagiri(~450 m above MSL). The peaks of these lofty range rise as high as 1800 m (BR hills 1400 to 1800 m; MM Hills 1000 to 1200 m). The highest hill is Kattari Betta, at 1800 MSL. Various observations point to a possible biogeographic link between BR hills and Nilgiri ranges.
Biogeographically, the sanctuary is unique. It is located between 11° and 12° N and the ridges of the hills run in the north-south direction. It is a projection of the Western Ghats in a north-easterly direction and meets the splintered hills of the Eastern Ghats at 78° E. This unique extension of Western Ghats constitutes a live bridge between the Eastern and Western Ghats with the sanctuary located almost in the middle of this bridge. Thus, the biota of BRT sanctuary can be expected to be predominantly of Western ghats in nature with significant proportion of eastern elements as well.
Read more about this topic: Biligiriranga Hills
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