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Mahamaham Festival in Kumbakonam
A rare Hindu pilgrimage bathing festival at the Mahamaham tank in Kumbakonam, held once roughly every twelve years when Jupiter enters Simha, when all of India's sacred rivers are believed to converge in the tank beside the Adi Kumbeswarar Temple, drawing pilgrim numbers that have earned it comparison to the Kumbh Mela.
The Mahamaham tank in Kumbakonam draws its name from the belief that all of India's sacred rivers converge in its waters once in a rare planetary alignment, when Jupiter enters the sign of Simha, an event that recurs on a roughly twelve-year cycle rather than annually.