Where was India's first oil well drilled, in 1889?

Explanation

1. 01

   Digboi in Assam is the site of India's first oil well, drilled in 1889.

2. 02

   Its refinery, commissioned in 1901, is the oldest working refinery in Asia.

3. 03

   Bombay High, off the Maharashtra coast, was found much later, in 1974, and Ankleshwar in Gujarat in the 1960s.