Ganga Dussehra is the annual celebration of the most sacred of Hindu rivers, Ganga, or the Ganges. The celebration lasts for ten days from the new moon at the beginning of Jyaistha (amanta reckoning). The last day, 10 Jyaistha, is the holiest of them all (this normally occurs in June in the Gregorian calendar, or occasionally at the end of May). Devotees are expected to bathe in the Ganga. If they cannot reach the banks of the river, many devotees will use water drawn from the Ganga that is kept at home to bathe. Alternatively, the devotee will bathe in ordinary water whilst invoking Ganga by prayer. This bathing is considered to impart purity from sin.