Hue Imperial City Map – The Imperial City is a walled fortress and palace in the city of Huế, the former imperial capital of Vietnam. The grounds of the Imperial City are protected by fortified ramparts 2 kilometers by 2 kilometers, and ringed by a moat. The water in the moat is routed from the Huong River (Perfume River) through a series of sluice gates.
This enclosure is the Citadel (Kinh thành). Inside the Citadel is the Imperial City (Hoàng thành), with a perimeter wall some 2.5 kilometers inlength. Within the Imperial City is the Purple Forbidden City (Tử cấm thành), a term similar to the Forbidden City in Beijing. Access to the innermost enclosure is restricted to the Nguyễn imperial family.
The Imperial City of Hue has a circumference of 10 kilometers with the height of 6.6 meters and 21 meters thick with forts being meanderingly arranged, accompanied by cannons, artilleries and ammunitions. Initially the fortress was built solely by soil, only to be replaced by bricks afterward. Surrounding the city is the complicated canal system served not only as a protection but also as a waterway with nearly seven kilometers.