Cairn Oil & Gas is the largest private sector producer of crude oil in India, currently producing from assets in Rajasthan, Andhra Pradesh and Gujarat. The Mangala field in Rajasthan, discovered in January 2004, was the largest onshore oil discovery in India in two decades. Mangala, Bhagyam and Aishwariya fields, the three major discoveries in the Rajasthan block, cumulatively have hydrocarbons reserves of approximately 2.2 billion barrels of oil equivalent.