[1] The annals Đại Nam Nhất Thống Chí by the History Department of the Nguyễn dynasty wrote about Ngu Binh Mountain as follows: "In the northeast of Huong Thuy emerges an even surface serving as a screen, a first bar in front of the citadel.
After observing that Bang Son resembled a screen, the Nguyễn emperor decided to build up Huế which became known as their "Forbidden Purple City."
Emperor Gia Long approved the design of geomancers which chose this mount as a front altar of the imposing and solid defending wall system, and renamed it Ngu Binh.
Towards the east is a dim white sand strip and Thuan An Estuary in the distance along the deep blue Eastern Sea.
Mingling with pine trees, grey roofs of pagodas and temples, as well as the ancient and meditative tombs, the Perfume River looks like a soft silk strip winding at the foot of the hill.