The shape, height, length and back of the left and right sand guards should also be harmonious and symmetrical, and the distance from the cave area should be appropriate. Too far and too low, too close, too high and too strong, 200 to 300 meters is the most suitable.
Feng Shui pays special attention to the choice of left and right sand protection. The sand on the left side of the cave site is called Shangsha, and the sand on the right side of Longsha is called Xiasha, also called Husha. Solemnly declare: the answer is for reference only, please don't be blindly superstitious.