High Quality Content by WIKIPEDIA articles! Coonoor is a town and a municipality in the Nilgiris district in the state of Tamil Nadu, India. It is known for its production of Nilgiri tea. Coonoor is located at an altitude of 1,800 m above sea level, and is the second largest hill station in the Nilgiri hills. It is an ideal base for a number of trekking expeditions leading into the Nilgiris.