1. Shangshu Yugong is China's first regional geography book.
2. It was written by people in the State of Wei in the Warring States Period under the name of Da Yu, so it was named Yu Gong.
3. The 1193 character book Yu Gong divides the country into nine districts (namely, "Jiuzhou") marked by natural geographical entities (mountains, rivers, etc.), and briefly describes the natural and human geographical phenomena of each district (prefecture), such as territory, mountains, rivers, vegetation, soil, products, tribute, minorities, transportation, etc.
