Besides geographical factors, the so-called "the first in Taihang" is also due to the connection between the two important places of Hedong River.
From the overall situation, Hedong River is guarded by the Yellow River and the north of the Yellow River. Xijing is an important place in the east. These two places are important to the Sui Dynasty, otherwise the rebels can attack Xijing when crossing the river. When the capital of the Qin Dynasty was established, […]