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Tiruvannamalai district (previously known as Central Arcot, Tiruvannamalai Sambhuvarayar District) is the largest and one of the 38 districts in the state of Tamil Nadu, in South India. It was formed in the year 1989 through the bifurcation of North Arcot into the Tiruvannamalai Sambuvarayar and Vellore Ambedkar districts. The city of Tiruvannamalai is the district headquarters. The district is divided into 12 Taluks—Arani, Chengam, Tiruvannamalai, Polur, Thandarampattu, Vandavasi, Kalasapakkam, Chetpet, Kilpennathur, Jamunamarathoor, Cheyyar and Vembakkam. As of 2011, the district had a population of 2,464,875 with a sex-ratio of 994 females for every 1,000 males. From Wikipedia