Masi Magam, also known as Maasi Makam, is a Tamil Hindu festival which is celebrated by Tamil speaking people. It is celebrated in Tamil month Masi during Makam Nakshatra. Usually, Makam Nakshatra prevails during Pournami or full moon day but that is not always true. Hence Masi Makam observation is not linked with full moon or Pournami but with Magha Nakshatra. Makam Nakshatra is also known as Magam and Magha.
On Masi Magam day, temples idols are taken to the seashore, pond or lake for a ceremonial bath in a procession. The devotees who flock the procession take dips in the water body to get rid of their sins.
Mahamaham Tank is a huge temple tank located in Kumbakonam, Tamil Nadu, India. It is considered to be the foremost and one of the largest temple tanks in Tamil Nadu. The Masimaham festival held in the tank has 100,000 visitors and the once-in-12-year Mahamaham festival has close to 2 million visitors
Masi Magam is observed not only in India but also in Singapore, Thailand and Indonesia.