A tributary of the Yarlung Tsangpo, the Lhasa River draws many people to the banks, particularly in the seventh month of the Tibetan Calendar. During the so-called Bathing Festival, participants enjoy their bathing and washing clothes from Garmagun in the east to Sahu in the south and at Rainbow Spring at the foot of Sera Monastery. A legend says that during this period the Lhasa River changes into holy water. One can join the local people in bathing in this sacred water. From the southern bank of the river, one can see a clear reflection of the Potala Palace in the river. Photographers and others wait with great anticipation for this beautiful scene to appear.