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In page Mahamaham:

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The Mahamaham festival – also referred to as the Maha Magam festival – and the holy dip tradition of the South Indian Hindus was documented by the British colonial era writers in the 19th century.[2] The last Mahamaham was celebrated on 22 February 2016 with over a million[citation needed] people from various places taking the holy dip in the Mahamaham tank.[3] The festival with its dip-in-the-tank-waters tradition extends over 10 days (Brahmothsavam). The 10-day festivities are also observed with lesser crowds in the Magha month (about February) every year between the 12-year Maha (major) cycle. In the interim years, the event is called the Masi-maham festival.[4]