The Palni Hills (also Palani Hills) are a mountain range in Tamil Nadu state of South India. 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 the high Anamalai range on the west, and extend east into the plains of Tamil Nadu, covering an area of . The highest part of the range is in the southwest, and reaches 1,800-2,500 metres (5,906-8,202 feet) elevation; the eastern extension of the range is made up of hills 1,000-1,500 m (3,281-4,921 ft) high.