The Nilgiri Mountains form part of the Western Ghats in northwestern Tamil Nadu, Southern Karnataka, and eastern Kerala in India. They are located at the trijunction of three states and connect the Western Ghats with the Eastern Ghats. At least 24 of the Nilgiri Mountains' peaks are above 2,000 metres (6,600 ft), the highest peak being Doddabetta, at 2,637 metres (8,652 ft).

The Western Ghats, also known as the Sahyadris, is a mountain range that stretches 1,600 km (990 mi) along the western coast of the Indian peninsula. Covering an area of 160,000 km2 (62,000 sq mi), it traverses the states of Gujarat, Maharashtra, Goa, Karnataka, Kerala and Tamil Nadu. The mountains form an almost continuous chain of mountains along the western edge of the Deccan Plateau from the Tapti river to the southern tip of the Indian peninsula at Kanniyakumari. The Western Ghats meets with the Eastern Ghats at Nilgiris before continuing south.