The custom of carrying Kanwar started in the Treta Yuga - the silver age of Hindu mythology. Lord Rama had carried the holy ganges water from Sultanganj in a kanwar and offered to Lord Shiva at Babadham.
Shravani Mela starts in every month of Sawan (Hindi Month) July-August Month . More then 50 lakhs devotees come Sultanganj for take Holy water of Ganga River. After taking Holy water of Ganga River they go to Baidyanath Dham (Deoghar) by on foot in full month of Sawan. The total distance from Sultanganj to Baidynath Dham is 105 km. by old way and 90 km from new shortcut way. The person who goes Babadham (Deoghar) from Sultanganj on foot they called general Kanwariya. They reached Babadham in 3-4 days. The person who started non stop on foot journey from Sultanganj to Babadham for 110 km they called 'Dak - Bam'.