Nag Nathaiya is celebrated on the fourth lunar day of the dark fortnight of the Hindu month of Kartik (October–November). It commemorates the victory of Krishna over the serpent Kaliya. On this occasion, a large Kadamba tree (Neolamarckia cadamba) branch is planted on the banks of the Ganges so that a boy, playing the role of Krishna, can jump into the river on to the effigy representing Kaliya. He stands over the effigy in a dancing pose playing the flute, while an audience watches from the banks of the river or from boats.

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