Sivasagar district (Assamese: শিৱসাগৰ জিলা), formerly known as Sibsagar, is one of the 27 districts of Assam state in north-eastern India. Sivasagar city is the administrative headquarters of this district. It is known for its rich and diverse biodiversity.The districts covers an area of 2668 square kilometers as against total area of 78438 square kilometers of Assam as per census of 2001. The district comprises three sub-divisions – Sivasagar, Charaideo and Nazira. The main industries in Sivasagar are oil industry and tea industry. Majority of the population are agrarian. In 1999, Sivasagar district became home to the Panidihing Wildlife Sanctuary, which has an area of 34 km2. There are also many reserve forests like Abhaypur, Dilli, Diroi, Geleky and Saleh. There are some unclassified forests along the Nagaland and Arunachal border. The vegetation is mostly Tropical Evergreen with trees like Hollong, Titachapa, Nahor, Mekai etc. dominating the canopy. The district is also rich in fauna. Various rare and endangered mammals like Tiger, Elephant, Sun Bear, Sambar, Hoolock Gibbon etc. are found in the reserve forests.
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