Feng Shui says that "mountains are surrounded by water" and "jade belts are around the waist". Generally, there should be a good atmosphere at the bend of the river, and there should be good feng shui at the place surrounded by the river. But the rivers beside many communities are straight. In this case, how should we choose? The general principle is: if the residential area is located on the right side of the river, it is auspicious, if it is located on the left side of the river, it is fierce. As for the determination of the left and right sides of the river, it depends on the flow direction of the river: when the back is facing the incoming water, the left hand side is the left side of the river and the right hand side is the right side of the river. Since ancient times, most people have followed this principle when choosing cities, and built big cities on the right bank of the river, such as Chongqing, Changzhou, Nanjing, Wuxi, Suzhou and Shanghai, which are all located on the right side of the Yangtze River. Cities such as Lanzhou, Xi, Luoyang, Zhengzhou and Jinan are all located on the right side of the Yellow River. If a residential area is located on the right side of the river, then the river must flow clockwise, and this clockwise flowing river has a good strengthening effect on the feng shui gas field inside the residential area; Located in the community on the left side of the river, because the water flow is counterclockwise, the feng shui atmosphere inside the community will be greatly weakened.