A professor at the University of Munich thinks of China this way. He first divided China into east and west, and the east was divided into north and south by the Qinling Mountains and Huaihe River. The west is bounded by Kunlun Mountain, which is divided into northwest and southwest. South China is a "green China" with warm and humid climate and lush vegetation. There are vast North China Plain and Loess Plateau in the north of China, which is called "Yellow China". The Gobi desert in the northwest is vast, with long yellow sand and boundless sea, which is called "golden China"; There are magnificent Qinghai-Tibet Plateau, glaciers and snow peaks in the southwest, which is called "Silver China". As for land improvement, it can be described as follows: "Yellow China" has changed into "Green China", "Golden China" has changed into "Yellow China" and "Green China", "Green China" is greener and more lovely, and "Silver China" is mainly to protect the original environment. Thus, the German geographer had a comprehensive and profound understanding of the geographical features of China, and made a good refining and synthesis.