Cardamom hills are the most southern hills of India. It is situated at the border of Kerala and Tamil Nadu.

Explanation:

The mountainous region in south-east Kerala state, Cardamom Hills is a member of the Western Ghats range in southern India. Some of its eastern peaks are 4,500 feet above sea level (1,370 meters). Tea, coffee, teak and bamboo, and the named cardamoms are produced in the Cardamom Hills area.