Theni district is a district of the Tamil Nadu state in South India. The city of Theni is the district headquarters. The district is divided into two natural divisions: The hilly areas are constituted by parts of three taluks: Periyakulam, Uthamapalayam, and Andipatti with thick vegetation and perennial streams from the hills on the western side and Cumbum valley which lies in the Uthamapalayam taluk. As of 2011, Theni district had a population of 1,245,899 with a sex-ratio of 991 females for every 1,000 males.