How wide is the most narrow part of vietnam?

 The S-shaped country has a north-to-south distance of1,650 kilometers and is about 50 kilometers wide at the narrowest point.

The zhou dynasty (1046-256 bce) was the longest-lasting of china's dynasties. it followed the shang dynasty (c. 1600-1046 bce) and it finished when the army of the state of qin captured the city of chengzhou in 256 bce.