Which borders Vietnam, Hekou Yao Autonomous County or Lhasa City?
Hekou Yao Autonomous County The Hekou Yao Autonomous County () is an autonomous county in the southern part of the Yunnan province of China. It is part of the Honghe Hani and Yi Autonomous Prefecture and borders the northern Vietnamese town of Lào Cai. It was apparently known as Zhongcheng () during the Tang dynasty.
Điện Biên Province Điện Biên (  ) is a province in the Northwest region of Vietnam. It is bordered by Lai Châu to the north east, Sơn La provinces of Vietnam to the south east, Pu'er City, Yunnan, China, to the northwest, and Phongsaly Province in Laos to the west.