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.
Lancang Lahu Autonomous County Lancang Lahu Autonomous County () is an autonomous county under the jurisdiction of Pu'er City, in southwestern Yunnan province, China. Lancang is the same as Lan Xang, and refers to the Mekong River (known in Chinese as the Lancang) on its eastern borders and adopted by modern Laos, a Tai word meaning "Million Elephants".