The flag tower is built on the top of Dragon mountain, 1,700m above the sea level. Lung Cu commune is the Northmost point of Vietnam, away 170km north from Ha Giang town. The Flag tower was build during the Ly Thuong Kiet (XI Century) and originally made of wood marijuana plants. Lung Cu flag tower has a long history, going through repeated reconstruction and renovation. The new octagonal mast height of 30m was inaugurated on September 2010.
Yunnan Province in southwest China border, the provincial capital Kunming. Warring States period, this is the Dian tribe fowl. Yunnan, namely, "Caiyunzhinan"and the other argument is that because in the "Yunling of the South " is named. The total area of about 39 million square kilometers, accounting for 4.11% of total land area, the provincial administrative regions in the country ranked No. 8 in the area. The total population of 45,130,000 (2008), accounting for 3.36% of the population, the population ranked 13th. And Yunnan provinces adjacent to Sichuan, Guizhou, Guangxi, Tibet, Yunnan Province, three neighboring countries of Myanmar, Laos and Vietnam. Tropic of Cancer crosses from the southern province.