Situated in the Nallamalas - an offshoot of Southern Eastern Ghats of Andhra Pradesh, the sanctuary is hilly terrain with plateaus, ridges,gorges and deep valleys which support tropical mixed dry deciduous forests with an undergrwoth of Bamboo and Grass. The Project Tigher Circle, Srisailam is mainly constituted with the Nagarjunasagar Srisailam Tiger reserve, Rollapadu wildlife sanctuary and Gundla Braheswaram Wildlife Sanctuary. It spreads over Kurnool,Prakasam and Guntur Districts and is headed by the Field Director,Project Tiger Circle,Srisailam
The Circle consists of (4) wildlife/Territorial Divisions i.e., Atmakur WLM,Markapur WLM,Flying Squag and Bio-Diversity Reasearch Division at Srisailam
|S.No.||Name of the Division||District||Area (in Sq.kms.)|
|4||Extended GBM Sanctuary||1194.00|
The tiger reserve harbors endemic species like Andrographis nallamalayana, Eriolaena lushingtonii, Crotalaria madurensis var, Dicliptera beddomei and premna hamitonii making it a prospective germ plasm bank. It has been estimated that there are 1581 taxa spread over 149 families occuring in Nallamala which include 29 grass species and 353 medicinal species.
Over 80 species of mammals,303 species of Birds,54 species of reptiles ,20 amphibians, 55 fishes, 101 Butterfiles, 57 species of Moths,45 species of Coleopterans, 35 species of Odonata and numerous other forms of insects are found in the area. The recent Bio-systematic studies carried out by the scientists of Eco-Research and monitoring laboratories led to the discovery of certain new species which were hitherto not recorded.