Kumbakonam comprises of the Mahadharam lake. This lake is considered very sacred by the devotees. Taking a bath in this lake is considered very sacred during the Kumbha fair. Devotees visiting this place take baths and purify themselves in the same lake. It is also known by the name ‘Navganga Kund'. It is believed that during the auspicious time of the Kumbha fair, nine rivers meet and take a bath in this lake. They bless the devotees and purify them. These nine rivers are Ganga, Yamuna, Saraswati, Narmada, Godavari, Kaveri, Saryu, Mahanadi and Payoshni. It is also believed that during this time, Lord Shiva, Lord Vishnu and other Devas reside in this place. Its is said that during Kumbha fair, this Lake fills with the water of river Ganga and a new stream flows from the bottom. Temples and Ghats have been bulit surrounding this lake where devotees offer their prayers.