Nagarjunsagar-Srisailam Tiger Reserve
Nagarjunsagar-Srisailam Tiger Reserve is the largest tiger reserve in India . The reserve spreads over five districts, Kurnool District, Prakasam District, Guntur District, Nalgonda District and Mahabub Nagar district. The total area of the tiger reserve is . The core area of this reserve is . The reservoirs and temples of Srisailam are major attraction for many tourists and pilgrims. It is the largest tiger reserve forest in India and is located inside Nallamala forest area.. Geography. This reserve is located between longitude: 78°30' to 79°28' east and latitude: 15°53' to 16 °43' north. Elevation varies from to above mean sea level. Average annual rainfall is . The hill ranges contain a number of plateaus, of which, Amrabad, Srisailam, Peddacheruvu, Sivapuram, and Nekkanti are noteworthy. Nagarjunasagar receives rains from the southwest monsoon, which is active from the second half of June to the end of September. The Krishna river cuts its basin almost deep over a distance of through the reserve. There are several waterfalls in the reserve such as the Ethipothala Falls, Pedda Dukudu, Gundam and Chaleswaram. Ancient history. The ancient temples at Srisailam of Lord Mallikarjuna and his consort goddess  Bhramaramba, an incarnation of Parvathi as the fair-complexioned boon from Brahma, contain one of the twelve sacred Shaiva Jyotirlingas and one of the eighteen Maha Shakthi peethas in India. This area contains ruins of Nagarjuna Viswa Vidyalayam. The site was once the location of many Buddhist universities and monasteries. The ruins of a fort of the 3rd century BCE Indian ruler, Ikshwaku Chandragupta overlook the Nirjivapuram (Lifeless city) valley. The ancient fort of king Pratap Rudra of the Kakatiya dynasty and several other forts are visible on the banks of the Krishna River. An ancient wall constructed there by  the Kakateeyas is an impressive historic feature. This area contains several rock shelters and cave temples including: Akka Mahadevi Bhilam, Dattatreya Bhilam, Umaa Maheswaram, Kadalivanam, and Palankasari. Flora. The main types of forest biomes in the reserve are: southern tropical dry mixed deciduous forest, "Hardwickia" forest and Deccan thorn scrub forests with much "Euphorbia" scrub. Important plant species here are: "Anogeissus latifolia" (axlewood), "Cleisthanthus collinus" (odcha), "Terminalia" spp., "Pterocarpus marsupium", "Hardwickia binata" (anjan tree), "Boswellia serrata" (Indian frankincense or salai), "Tectona grandis" (teak), "Mundulea sericea" and "Albizia" spp. (silkplants). Fauna. The main mammals in the reserve are: Bengal tiger, Indian  leopard, sloth bear, Ussuri dhole, Indian pangolin, chital, sambar deer, chevrotain, blackbuck, chinkara and chowsingha. Lesser fauna include mugger crocodile, Indian python, Indian cobra, rat snake, Bengal monitor, Indian star tortoise and Indian peafowl. Endemic reptiles like the skinks Ashwamedh writhing skink, Sharma's mabuya lizards and the Nagarjun Sagar racer snakeWildboar,Mongoose,Porcupine are particular highlights of this region.