"Not long before Southern (Vietnamese) envoy reached the South Holding Frontier Post, they had to traverse a mountain pass where another frontier post had reportedly stood. Although there were no longer any signs of this structure, the area was still referred to by its old name, Ghost Gate Frontier Post. Ghost Gate Frontier Post was located in Chi Linh hamlet in the On region of Lang Son defense command. It took its name from the fact that once a large boulder resembling a ghost's head stood there where the mountains divided to form a natural gate." Liam Kelley, in his book Beyond The Bronze Pillars.|
Ghost Gate Pass 20km south of Lang Son City in northeastern Vietnam by near the Chinese border, where Chinese armies were defeated.