Introduction to Qingshui Bay: Qingshui Bay is the fifth major turning bay, flowing into the Yellow River from west to east. It is also an important pass - Qingshui Pass. Qingshui Pass is an important pass in Guanjin and has been guarded by troops throughout the ages. In the Ming Dynasty, Huifeng Village was built five miles south and Nianwei Village was built in the north. To this day, in the cave dwellings that have not collapsed on the banks of the Qingshui Pass River, there are slogans written by the Red Army and " "Classroom Rules", on May 2, 1936, Mao Zedong led the Chinese Workers' and Peasants' Red Army to cross the Yellow River from the Qingshui Pass Ferry westward and return to northern Shaanxi.