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.
Rinbung County Rinbung County (Chinese: 仁布县; Pinyin: Rénbù Xiàn) is a county at the northeastern boundary of Xigazê in the Tibet Autonomous Region.