A few steps to the left, we came to a square pond made of stone. The square pond was not big, and it was two meters square. Looking from the railings, half a meter deep, clear and bottomless spring water, here is the spring eye of "Pearl Spring". The overflowing spring gushed out through a dark channel in a stone-engraved dragon nozzle in the distance. The water was very loud. The administrator said that the flow rate was 60 tons per hour, day and night. The spring water at the bottom of the pool rises up with bubbles. Bubbles appear in a series of different sizes, either left or right, near or far, or continuous or slightly stopped in the pool. The rising speed is slow and stable, and the bubbles will break up only when they reach the surface of the water. Each bubble of different sizes, slightly oblate, in the gentle ascent will be around, before and after the up and down swing, significantly slightly opaque silver. We watched it quietly for a long time. In my impression, this ancient spring is the most beautiful, the most durable and the longest.