Hoan Kiem Lake Hanoi also known as “Sword Lake,” is a freshwater lake in the center of Hanoi. It is famous for its peaceful beauty, its cultural as well as historical values. Located right in the center of the capital of Vietnam, Hoan Kiem Lake Hanoi is famous for its peaceful beauty, its cultural as well as historical values. Many beautiful words are used to describe the beauty of the lake such as picturesque, magnificent, dreamy, mysterious