The "sand" in our geomantic omen refers to the mountains accompanied by the main dragon, especially the mountains surrounded by layers around the cave factory. In the context of geomantic omen, the sand mountain must have ups and downs, and the more levels, the better, forming a situation of surrounding, guarding and assisting acupoint areas.
In geomantic omen, the peaks on the left and right sides of the cave area are called Zuo Fu Youbi, also known as Left and Right Sand Protection, or Longhu Sand Mountain. Shaped like a horn cicada wing, it is called a cicada wing sand mountain. In the case of sand protection in the air, the dragon has no sand solitary, and the cave has no sand cold. Therefore, the role of sand protection is to protect the cave from the wind and embrace all beings.
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, the potential is scattered, too close and too strong.