Why are there missing corners in the northwest corners of Tongzihe River in Beijing City and the Forbidden City?

At that time, it was mainly because when people were expanding the road, they found that there was a conflict between the Tongzi River and the road, so the Construction Bureau decided to erase a corner of the northwest part of the Tongzi River. At that time, the northwest corner of the Tongzi River in the Forbidden City was missing a corner because of construction, not because of Feng Shui. The missing corners of Beijing City and the Forbidden City Tongzi Hebei are actually caused intentionally by humans. Someone once interpreted the missing northwest corner and the skewed southeast corner of Beijing as the sky falling in the northwest and the earth sinking in the southeast in Feng Shui. You must know that Feng Shui itself is a relatively superstitious idea, so it has no scientific basis. This kind of thinking makes people feel ridiculous in the face of reality. According to the so-called Feng Shui theory at that time, some people called the missing corner in the northwest the sky gap. It is said that the ancient kings at that time were all influenced by feudal superstitions, so they attached great importance to Feng Shui. When building the palace, they would also ask workers to pay special attention to these aspects. But you must know that the imperial palaces of the Southern Dynasty, Northern Song Dynasty and Tang Dynasty all lacked the northwest corner. Only the Forbidden City in Beijing lacked the northwest corner. At that time, people began to take some measures to understand these reasons. Through multiple satellite photos, it can be seen that from Jishuitan to Xizhimen, it has always been a wetland in history. On the southeast side of this wetland, there is a very obvious trace of the diagonal city wall. In addition, there is another trace of this sloping wall that points in the east-west direction. Not only that, according to the geological structure map at that time, there was also an oblique zone fault layer from Erligou to Deshengmen. It can be seen from the traces of these city walls at that time that it was actually because the north and southwest corners of the city were built at a right angle. Later, due to the influence of wetlands and fault zones, they had to be changed to an oblique building. The fact that the southeast corner wall of the outer city is not straight is also due to the influence of the wetlands at that time, and has nothing to do with the so-called Feng Shui theory. The missing corner in the northwest of Tongzi River was because the expansion of the road during the Republic of China conflicted with the river, so the Construction Bureau decided to erase the northwest corner.