Built on the top of Dragon mountain, in the district of Dong Van and modeled on the flag tower of Hanoi. Plug in the 12.9 m flagstaff is a national flag with an area of 54m², representing for 54 ethnic groups of Vietnam. At the foot tower, there is a commemorative house, where displays production tools, costumes and cultural products of the ethnic groups in Ha Giang. From distances, Lung Cu is very spectacular with three quarters of the land covered with stone, a national flag pole erected on the top of the mountain, which is surrounded with magnificent and majestic mountain forests at 1,600 m above sea level.