Mahamaham Tank(Mahamaham kulam) is a huge temple tank located in Kumbakonam, Tamil Nadu, India.
Mahamaham is a Hindu Kumb Mela festival celebrated every 12 years in the temple-town of Kumbakonam. Hindus consider taking a holy dip at the Mahamaham tank on the day of Mahamaham as sacred.
The last Mahamaham was celebrated on March 6, 2004.
The festival is celebrated at an interval of around eleven to twelve years. The festival takes place at a particular time as determined by astrological position: during the full moon of the Tamil month of Thai (February-March) when the conjunction of the moon with the lunar asterism (Magha Nakshatra) and when Jupiter is in the constellation of Leo.
The tank has 20 holy wells(Theertham).
avari, Narmada, Saraswathi, Kaveri, Tungabatra, Krishna and Sarayu. At the centre of all these exists the Sixty-six crore theertham, believed to be the most sacred of all.