Friendship Pass (Chinese:友谊关,formerly 镇南关, Vietnamese: Hữu Nghị Quan, formerly Ải Nam Quan (both the present Vietnamese and Chinese names mean Friendship Pass) is a pass in the border between the China’s Guangxi and Vietnam’s Lang Son Province. Vietnamese national road 1A starts from this gate, which lies less than 5 km north of the town of Đồng Đăng in Lang Son Province, ending in Nam Can Town in Ca Mau Province. China National Highway 322 runs from here to Guangxi Province and Hunan Province. This is one of the busiest border trading points of Vietnam.
According to Wikipedia in Chinese, it was built in early Ming dynasty with the name of Zhen Nan Guan (鎮南關 - South suppressing pass). 1953, its name was changed into Mu Nan Guan (睦南关 - South watching pass). 1965, its name was changed into You Yi Guan (友誼关 - Friendship pass).
Media related to [//commons.wikimedia.org/wiki/Category:Zhennan_Pass Zhennan Pass] at Wikimedia Commons