Which state is the largest producer of petroleum in India?

Rajasthan is the largest producer of petroleum in India followed by Gujarat and Assam. Rajasthan has a share of about 23.29% in crude oil production in the country. In India, oil is found in Assam, Gujarat, Mumbai High and in the river basins of Godavari and Krishna. 

Further Reading:

• NCERT Notes: Geography- Some major minerals and their characteristic
• Geography Notes