Kottamala

Kottamala (கோட்டைமலை/കോട്ടമല) near Rajapalayam in the Grizzled Squirrel Wildlife Sanctuary in Tamil Nadu and the adjoining Mlappara area of Periyar Wildlife Sanctuary in Kerala is a tall mountain peak situated in the Western Ghats at an altitude of 2,019m. It is one of the few tall peaks in the Western Ghats; and the highest peak of all in the Periyar plateau exceeding 2,000m.]). 
Kottamala is the southernmost peak higher than in India.
References.
RameshChristopher