Co Loa Citadel (Cổ Loa) is one of the oldest and most significant fortresses in Vietnam, located on the outskirts of Hanoi. This unique historical site is an impressive architectural monument that resembles a snail shell in shape, which earned it one of its poetic names—the "Snail Citadel."

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The fortress is notable for its complex structure. It consists of three concentric earthen ramparts: the outer, middle, and inner citadel. According to historical records, there were originally nine of these rampart walls, highlighting the scale and strategic importance of this ancient defensive structure.
Co Loa holds immense cultural and historical significance as it is considered the first political center of ancient Vietnamese civilization. It is the oldest surviving cultural heritage site in Vietnam, which, along with the Imperial Citadel of Thang Long in Hanoi, stands as a witness to the nation's thousand-year history. A visit to Co Loa Citadel allows you to touch the roots of Vietnamese statehood and culture.