Weak water, writing, ancient myths and legends called it a dangerous and difficult river and sea. Fenglin Prefecture: "Fenglin Prefecture is in the middle of the West Sea, with a place of 1,500 miles. There is weak water around the mainland, and a feather can't float. " Refers to a steep and distant river, which is often used as "three thousand weak waters, only one scoop of water", meaning single-minded love. Weak water is also another name of Heihe River in China, from Ding Xin in Jinta County to Huxi New Village in Ejina Banner.