Tianjian Grand Canyon is the only fault in the Tiangang mountains, which stretches for thousands of miles. It's said that this canyon is the only fault in the windstorm city of the Tianyuan empire. It's said that in the ancient legend, a strong peak split the Tiangang mountains into two sections with one sword, so it's said that

and tianjianmen is also named after this. It is also said that the man who split the Tiangang mountains is his predecessor, but whether there is any connection or not is only known by tianjianmen

but if today's sword gate is gone, Tianjian Canyon still exists, and it becomes the dividing line...