Introduction to the side dam: Bianba County, which belongs to Changdu City, Tibet Autonomous Region, is located in the northeast of Tibet, west of Changdu City, and south of Nyainqentanglha Mountain. The average altitude of Bianba County is 3,500 meters, and the highest altitude is over 5,500 meters. It is more than 400 kilometers from Changdu, and more than 800 kilometers away from Lhasa, the capital of the autonomous region. As of 2013, Bianba County has jurisdiction over 2 towns and 9 townships, with a total area of ​​8881 square kilometers. Bianba County is mainly agricultural, with both animal husbandry and forestry. The crops include barley, winter wheat, spring wheat, beans, and rapeseed.