Feng Shui: Is there a dragon cave in the plain?

Look at the mountain dragon and the water dragon; We can't find the obvious high mountains and flowing water. We take the height of one inch as the mountain, the height of one inch as the water, and the way, road and diameter as the dragon species, which are not limited to each other. I want to know how to look at it, how to choose it and how to use it. So it is not difficult to find dragons in plain areas, and not all dragons will produce accessible caves.