The boundary between Hong Kong Special Administrative Region and China can be regarded as the "frontier of Hong Kong", because there is immigration control or "closed" except to residents on the margin of the border. The Hong Kong side is patrolled and controlled by the Hong Kong Police Force to prevent "illegal immigrants" crossing from Hong Kong to China and vice versa. As China's economic development catches up with Hong Kong, some parts of the border are no longer "closed", hence it is possible to run along the border area. This is exciting because it is "new".
For more information, please visit the following website:
https://en.wikipedia.org/wiki/Boundaries_of_Hong_Kong
Names of places along the route is given in the photo above. (2022-05-16_093808.jpg)
