The mountains and sea combined to make Hoa Lu’s picturesque landscape. Hoa Lu lays in a flat valley surrounded by the Trang An lime stone mountains, which form a natural wall protecting the old citadel.
Perhaps the oldest citadel in Vietnam, Co Loa Citadel in Hanoi’s suburban district of Dong Anh, evokes the history of the kingdom of Au Lac and its king An Duong Vuong and the legend of My Chau and Trong Thuy and their ill-fated love.
