 The Weak River flowed with "water" so lacking in specific gravity that even a feather would not float, thus being a protective barrier against the unworthy, who otherwise would profane the paradise on Kunlun, and perhaps even climb up to Heaven and disturb the deities and other inhabitants residing there.In the novel "Journey to the West", the Weak Water River forms one of the obstacles the fictional version of the monk Xuanzang, the magic monkey Sun Wukong, and companions must cross over on their mission to fetch the Buddhist scriptures from India and return them to Tang China.Chinese mythology and imagination developed an extensive collection of ideas.