Digboi is a city and a Digboi Municipal Corporation in Tinsukia district in the north-eastern part of the state of Assam, India.
Crude oil was discovered here in late 19th century and first oil well was dug in 1866. Digboi is known as the Oil City of Assam where the first oil well in Asia was drilled. The first refinery was started here as early as 1901. Digboi has the oldest oil well in operation in India. From Wikipedia
