Why didn't any emperor choose to build his capital in Nanjing before the Three Kingdoms?

In the pre-Qin period, every vassal state had to carry out geomantic tests on the selected land when building its capital. The emperors of all previous dynasties must have carefully studied Nanjing before choosing Nanjing as the capital, and Nanjing's kingliness did exist. This statement began to spread during the Qin Shihuang period. Nanjing faces the Yangtze River in the north, just like a winding dragon, but the Yangtze River is too close and the current is too fast. Some people say that the choppy Yangtze River took away the emperor's qi in Nanjing, so the dynasty king whose capital was Nanjing vented his anger too quickly, so he died easily.

That is to say, the rapid gathering of Wang Qi in Nanjing is helpful to the rapid unification of the dynasty, but at the same time, it can also be vented quickly, which is not conducive to the generations of the dynasty.

In Feng Shui, besides paying attention to the water potential, we also pay special attention to the mountain potential, which is the symbol of Long Mai. Although Nanjing is not surrounded by mountains on all sides, it can still be called the advantage of the moon. There are Shogunate Mountain and Lulongshan nearby, and Jilong Mountain and Fugui Mountain in the distance, all of which can be regarded as the backers of Nanjing City, forming the trend of gathering gas in Long Mai. Unfortunately, the mountain is too small to meet the requirements of royal feng shui. To put it simply, the mountains in Nanjing city can't reach the level of royal feng shui, which is also a flaw in Nanjing feng shui.

From the landscape analysis, Nanjing is an alternative in the imperial city. It carries the Yangtze River, the largest water dragon in China. The mighty mountains and rivers of the Yangtze River are absolutely worthy of God's Wang Fengshui, but the Yangtze River water comes and goes quickly, so the king vented his anger quickly and the dynasty lost quickly. In addition, there are no majestic mountains like Mount Tai and Songshan as backers, and the surrounding mountains are weak and not worthy of the dignity of the son of heaven, so they can't stop the king of Nanjing. The king leaked out and the dynasty naturally lived short.