Hulao Pass, Xingyang, Henan 河南荥阳虎牢关
Hulao Pass, also called Sishui Pass or Chenggao Pass, lies in Sishui Town northwest of Xingyang, Henan, between the foothills of Mount Song to the south and the Yellow River to the north – the eastern gateway to Luoyang. Early in the Tang, Li Shimin crushed Dou Jiande here, clearing the way for reunification; the Romance of the Three Kingdoms also sets its tale of three heroes fighting Lü Bu at this pass.