The central sector of Imperial Citadel of Thang Long – Ha Noi covers area of 18.395ha, includes archaeological area at 18 Hoang Dieu Street and relics in Ha Noi Citadel such as: Ha Noi Flag Tower, Doan Mon, Kinh Thien Palace, Building D67, Hau Lau

The citadel of the Ho Dynasty is situated in communes of Vinh Tien, Vinh Long, Vinh Quang, Vinh Yen, Vinh Phuc, Vinh Ninh, Vinh Khang, Vinh Thanh and Vinh Loc Town (Vinh Loc District), Thanh Hoa Province. It was the capital of Viet Nam from 1398 to 1407.