Which Indian state has the highest reserves of crude oil and petroleum production onshore, particularly in the Digboi and Naharkatia regions?

💡 Solution & Explanation

Assam holds a pre-eminent position in India's onshore crude oil production history, being home to legendary oilfields like Digboi, which is Asia's oldest continuously producing oilfield, alongside Naharkatia and Moran. Other states like Gujarat and Rajasthan also contribute significantly to petroleum output, but Assam remains the historic cradle of Indian commercial oil exploration. The country's first commercial oil refinery was established at Digboi in the late nineteenth century.