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. Hekou Yao Autonomous County:  It is part of the Honghe Hani and Yi Autonomous Prefecture and borders the northern Vietnamese town of Lào Cai.
i don't know