I'll tell you about the history. The ancient Yangzhou of Kyushu, the ancient Yangzhou from the Huai River all the way to the southeast coast, including the current Shanghai, Nanjing, Fujian, Zhejiang at that time was a small number of people, the property is not rich,

I'll tell you about the history.

The ancient Yangzhou of Kyushu, the ancient Yangzhou from the Huai River all the way to the southeast coast, including the current Shanghai, Nanjing, Fujian, Zhejiang at that time was a small number of people, the products are not rich, everywhere is silt swamps, wild beasts are infested.

So it paid tribute to animal teeth, bird feathers, used as ornaments, grapefruit, oranges to supplement tianzi with vitamins, and bamboo arrows.

In particular, it is mentioned in the "Yugong" that ancient Yangzhou is rich in minerals, and the three golden products (gold, silver, and red copper) of tribute are the best.