Which location in Assam is home to the oldest operating oil refinery in Asia?

The correct answer is Digboi. Key Points Digboi Refinery, commissioned in 1901, is the oldest operating oil refinery in Asia and one of the oldest in the world. It was established by the Assam Oil Company and is currently managed by the Indian Oil Corporation (IOCL). The discovery of oil in Digboi during the late 19th century marked the beginning of the oil and gas industry in India. Known as the 'Oil City of Assam', Digboi remains a significant historical and economic landmark for the state's petroleum sector. Additional Information Noonmati: Located in Guwahati, it is the site of the Guwahati Refinery , India's first public sector refinery, commissioned in 1962. Bongaigaon: This refinery (BGR) was the eighth refinery of IOCL and is integrated with a petrochemical complex . Numaligarh: The Numaligarh Refinery (NRL) , known as the 'Accord Refinery', was established following the Assam Accord of 1985. Crude Oil: Assam contributes significantly to India's domestic crude oil production, with major fields located in Upper Assam.