Nanjing is a blessed land with excellent geomantic omen and is known as the Dragon and Tiger. This thing is mysterious, and contemporary people don't feel much about it. However, in ancient times, feng shui was very important. We often hear a courtier say that his grave has chosen a place with the style of an emperor, and the emperor will generally be furious with the courtier. This shows how much feng shui was valued in ancient times. It is said that Qin Shihuang felt that he couldn't support the emperor's qi in Nanjing, so he built a Qinhuai River and unloaded the emperor's qi in Nanjing, resulting in a short life span in Nanjing.
Since China's economic center shifted to the south, Jiangsu and Zhejiang provinces have been developed areas, including today. There are rich products here. If this standard is implemented today, it is likely that things will not be called, and everything produced will be shipped to Beijing. But at that time, road transportation was very slow. And Beijing usually needs to use a lot of food crops and cloth.
Nanjing is located in the middle and upper reaches of the Yangtze River, with a superior geographical position. On the one hand, all kinds of supplies from all over the country can be transported to Nanjing continuously according to the canal and the Yangtze River. You know, there were no trains in ancient times. Protecting things with ox carts is neither safe nor expensive. Waterway is undoubtedly the most important mode of transportation. In addition, the Yangtze River, as a dangerous beach, can stop the attacks of the northern nationalities, especially the soldiers in the northern areas are not suitable for water warfare. The confrontation at Chibi is an effective example.
Three of China's four ancient capitals are in the north, and Nanjing is the only ancient city in the south, which shows that Nanjing is the most suitable big city to move its capital to the south. Let's take a look at the period when Nanjing moved its capital. There were Song, Qi, Liang and Chen in the Northern and Southern Dynasties, and Cao Wei regime in the northern part of Wu, while the northern part was still under the rule of the Yuan Dynasty when the capital was established in the Ming Dynasty. It can be seen that Nanjing, as the imperial capital, is generally in the period of partition between the north and the south. I think this is also the reason why Nanjing has a short life span. In ancient China, the unification war was generally the unification of the north and the south, and the south fought against the north. Therefore, Nanjing, as the capital of separatist parties in the southern region, is usually destroyed after a period of stalemate.