Yen Tu Festival in Uong Bi
Yen Tu Festival is a three-month Buddhist pilgrimage held in the Yen Tu mountains of Quang Ninh province, near Uong Bi, running from the first day of the lunar new year through the end of the third lunar month. Pilgrims travel to Dong Pagoda and the surrounding complex founded by 13th-century King-Monk Tran Nhan Tong, who established Vietnam's first native school of Zen Buddhism there.
Yen Tu Festival runs for three full months each year, from the first day of the lunar calendar through the end of the third lunar month, making it one of the longest-running religious festivals in Vietnam.