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The district has been witness to the long history of Hanoi. In the early Lý dynasty, in 545, the emperor Lý Nam Đế settled his encampment, and built a wooden raft on the Tô Lịch River to defend against invasion of the Liang dynasty. During the Nguyễn dynasty, Emperor Minh Mạng established the province of Hanoi in Hoàn Kiếm in 1831.
Turtle Tower (Tháp Rùa) on Hoàn Kiếm Lake, the natural habitat of the turtle in central Hanoi. Most authorities classify leloii as a junior synonym of the Yangtze giant softshell turtle, based a study by Farkas et al. [3] However, some Vietnamese biologists, such as Hà Đình Đức, who first described leloii, and Le Tran Binh, insist that the two turtles are not the same species.
Hoàn Kiếm Lake (Vietnamese: Hồ Hoàn Kiếm, chữ Hán: 湖還劍, meaning "Lake of the Returned Sword" or "Lake of the Restored Sword"), also known as Sword Lake (Hồ Gươm) or Tả Vọng Lake (Hồ Tả Vọng), is a fresh water lake, measuring some 12 ha in the historical center of Hanoi, the capital city of Vietnam.
It is more than 5 kilometres (3.1 mi) long, 200 metres (660 ft) high and 150 metres (490 ft) wide. Its cross-section is believed to be twice that of the next largest passage, in Deer Cave, Malaysia. [12] [13] The cave runs for about 9 km (5.6 mi) and is punctuated by two large dolines, areas where the ceiling of the cave has collapsed. The ...