Kasi Viswanathar Temple is situated very close to the Mahamaham tank and another one temple is placed in Solaiyappan Street. Here the main deity is Kasi Viswanathar/Visalakshi. The important and peculiar point about this temple is the Navakanniyar, which are the 9 holy rivers. It is believed that the Mahamaham function is closely associated with the 9 presiding deities namely Ganga, Yamuna, Narmada, Saraswati, Kaveri, Godavari, Tungabhadra, Krishna and Sarayu. Another important part is the stala lingam present in the southern part of the temple. It was worshipped by Ravana and is believed to grow with ages.
Lord Sri Rama, against his praiseworthy soft characters, had to acquire the traits of Rudra ‘anger’ to wage a war against Ravana to rescue Mother Sita. He approached Sage Agasthya to become a war man. The Sage advised Lord to stay in Kumbakonam for a while and worship Lord Kasi Viswanatha to acquire the angry war character. Rama, following the advice of the sage, succeeded in His wish. As Lord Rama acquired the Aarokanam acquiring the trait of His need then, this place is also known as Karonam. Nava Kannikas ‘Ganga, Yamuna, Godavari, Saraswathi, Narmada, Tungabhadra, Krishna, Sarayu and Cauvery’ were at a loss to know how to shed the sins left on them by people who had the holy dip in the above rivers. They approached Lord Shiva for the solution. Lord advised them to go to Kumbakonam on the Maha Magam day and bathe in the holy tank to cleanse themselves of the sins set on them. The Kannikas had the darshan of Lord Kasi Viswanatha and begged Him to stay here itself for the sake of the common people which Lord obliged. The place has huge statues of these Nava Kannikas.
The significant feature in the temple is that Mother Durga is facing Lord Chandikeswara. The temple has shrines for Saptha Madhas, Lord Bhairava, Sun, Moon, Mother Jeshta Devi, Lingodhbava, Sri Anjaneya, Mother Mahishasura Mardini and Lord Dakshinamurthi.