Which one of the following Oil Refineries is not located in Assam?

Assam is home to four major oil refineries: Digboi, Guwahati (Noonmati), Bongaigaon, and Numaligarh [3]. Digboi is the oldest operating refinery in India, established in 1901. The Bongaigaon refinery was established to process crude oil from the Naharkatiya and Lakwa fields [1], while the Numaligarh refinery was commissioned in 1999. In contrast, the Tatipaka refinery is not located in Assam; it is a mini-refinery operated by the Oil and Natural Gas Corporation (ONGC) situated in the East Godavari district of Andhra Pradesh [4]. Therefore, while Numaligarh, Bongaigaon, and Digboi are integral to the petroleum industry in Assam, Tatipaka belongs to the Krishna-Godavari basin in southern India.

Sources

1. [1] https://dte.assam.gov.in/sites/default/files/swf_utility_folder/departments/dte_medhassu_in_oid_5/portlet/level_3/pre_notes_6th_-semcode-ch-604.pdf
2. [3] Geography of India ,Majid Husain, (McGrawHill 9th ed.) > Chapter 8: Energy Resources > 1. Pipelines of North-East India > p. 14
3. [4] Geography of India ,Majid Husain, (McGrawHill 9th ed.) > Chapter 8: Energy Resources > India: Refineries and their Production Capacity > p. 16