Gunaseelam Vishnu Temple is located on the banks of river Kollidam. A visit temple is believed to be a curative to the mentally challenged people, who are taken to the temple and kept in the temple premises for 48 days. At the end of the 48 days it is believed that their illness is cured by the grace of the presiding deity, Prasanna Venkatachalapathi. The name of the place Gunaseelam derives from “Gunam” (meaning cure) and “Seelam” (meaning place), meaning the place in which illness is cured. “Gunam” also means qualities and “seelam” also means “Assuming a lower position”. Hence Gunaseelam is the place where Vishnu comes down and addresses the devotee’s problems from his heavenly position. The temple has set up a mental health rehabilitation centre that has the official stamp of the Tamil Nadu Government license, the first of its kind in Tamil Nadu. In Bhavishyotra Purana, one finds reference to the significance of this temple in Gunaseela Mahaatmiyam. Thaalpiya Maharishi along with his disciple Gunaseela Rishi once went to the Himalayas. On his way back, Gunaseela Rishi stayed back at Tirupati and was so attracted to Lord Venkatachalapathi that he wanted the Lord to appear in Gunaseelam and bless the devotees. He came back, bathed in the Cauvery and undertook severe penance here in his ashram in Gunaseelam. Impressed with his sincerity, the Lord appeared before him along with Goddess and promised to remain here till the end of Kali Yugam. Pleased with the darshan of Prasanna Venkatachalapathi, Gunaseela Maharishi continued to offer his daily pooja’s to the lord from his ashram here. At the end of the Dwapara Yugam, the Gunaseela Maharishi’s Guru wanted him to go to Naimisaaranyam. Gunaseela Rishi designated his young disciple to continue the daily pooja’s. However, floods in the Cauvery and dangerous animals in the forest led the disciple to flee the place and thus the pooja’s came to an abrupt end. The Lord decided to hide himself in a pit. After several years, Chola king Nyana Varma, who ruled this place with Urayur as the capital, used to visit Gunaseelam regularly. Every day, cowherds would milk the cows from near the pit and carry the milk all the way back to his court. One day, to everyone’s shock, the milk that was filled to the brim of the pot vanished all of a sudden. An invisible voice wanted the king to dissolve the pit by pouring milk. The king brought in his army and used thousands of liters of milk to complete this exercise. Once dissolved, Vaikunta Vasudevan is said to have appeared before the king as Prasanna Venkatesan. As per the king’s wishes, the Lord agreed to remain here till the end of Kali Yugam and help fulfill all the prayers of the devotees, who visit this temple. Delighted at the darshan of Prasanna Venkatachalapathi, the king shifted from Urayur to Kallur, (this place was then called ‘Badra Chakra Pattinam’) near Gunaseelam and built the beautiful Gunaseelam temple and laid down the process of the daily pooja’s as directed by Prasanna Venkatesan. He also allocated a lot of land for the temple as well as funds to undertake the daily pooja formalities.