Thirumoorthy Hills is located adjoining to the Thirumoothy dam, and the Thirumoothy temple is located in the hills. There is a stream flowing by the Sir Amaralingeswarar temple and the Thirumoorthy falls in these hills. Legends say that Athari Maharishi and his wife Anushiya Devi resided in these hills, and the Gods of the Hindu trinity had come down to test their devotion.
The Gods asked them to make their offerings with Anushiya Devi in nudity. She agreed and changed the Gods in babies with her devotion and fed them. The Gods blessed the couple and left and the Hills came to be known by their name.