Hanoi Huanjian Lake is located in the old urban area. Legends about it can not be separated from the four roles of Lake, Sword, Turtle and Taizu Li, hence its name. The lake is oval, the water is clear and clean, the trees around the lake shore are green, and the environment is quiet and elegant. Many Vietnamese students are often seen at the lakeside with picture boards and serious portraits. It is also a favorite place for local people to take a leisure walk.