It is the first regional geography book in China. This was written by a man in the state of Wei in the Warring States period under the name of Dayu, so it was named Yugong. This is a plan for governing the country put forward by Gong Yu, the writer of this article, after the unification of feudal lords at that time. This is a grand and careful plan, which is not equal to the usual one, so it is called Dayu, and I hope it can be really implemented.
This article "Gong Yu" divides the world into Kyushu based on geography, which is the author's ideal political division. In addition, it also includes mountains, rivers, soil, fields, products, roads, tribes and so on, all of which are discussed in detail.