The Palani Hills are a mountain range in the southern Indian states of Tamil Nadu and Kerala. The Palani Hills are an eastward extension of the Western Ghats ranges, which run parallel to the west coast of India. The Palani Hills adjoin with the high Anamalai range on the west and extend east into the plains of Tamil Nadu, covering an area of 2,068 square kilometres (798 sq mi). The highest part of the range is in the southwest, and reaches 1,800-2,500 metres elevation; the eastern extension of the range is made up of hills 1,000-1,500 m (3,281-4,921 ft) high.

The Anamala or Anaimalai, also known as the Elephant Mountains, are a range of mountains in the southern Western Ghats of central Kerala and span the border of western Tamil Nadu in Southern India. The name anamala is derived from the Malayalam word aana and the Tamil word yaanai, meaning elephant, or from tribal languages. Mala or Malai means 'mountain', and thus literally translatable as 'Elephant mountain'.