The Imperial City in Hue is a walled fortress and palace in the former capital of Vietnam. The grounds were surrounded by a wall 2 kilometers by 2 kilometers, and the walls were surrounded by a moat. The water from the moat was taken from the Huong River (Perfume River) that flows through Hue. This structure is called the citadel. Inside the citadel was the Imperial City. Inside the Imperial City was the imperial enclosure, called the Purple Forbidden City. The enclosure was reserved for the Ngu
