C71 Large wave of sand

Bo Langsha, on the northern side of the Yellow River, on the southern side of the Official Du, was situated on the Eastern Road, which the First Emperor had to cross. A thousand li of yellow sand, rolling up and down continuously. After a short while, it began to rise and fall, and swamps began to form.

This was Mang Shan's remnant vein. As far as the eye could see