Patio introduction: The patio, also known as "Dragon Pond", is not man-made, nor was it caught by the legendary dragon. It is a natural landscape formed by changes in the earth's crust caused by ancient volcanic eruptions. The patio is 9 to 12 meters long, 4.5 to 6 meters wide, and 14.8 meters deep. It seems unfathomable and quite thrilling and spectacular. The water in the well is clear and sweet, and never dries up all year round. When you hit the water with a stone, the sound is like a loud bell, which has been amazed by tourists of all ages. "Jimo County Chronicles" written by Wanli of the Ming Dynasty has a record of "Longlin in the Tianjing": "There are swamps on the top of the mountain that go straight down, and the Bairenhu water is deep and never runs dry." In the second year of Kangxi's reign in the Qing Dynasty, he was a person who took the imperial examination in Guimao and was known as "the crown of poets in the city." There is a record in Huangyan: "There is a stone well on the top of the mountain... The water is clear and clear, and when you throw something into it, there is a sonorous sound. It is called this sea orifice, and it leads down to Jiaolong Palace." There is Laoshan granite on the edge of the well mouth. The completed stone fence is 1.5 meters high and 40 meters in circumference. Its shape has the potential of a "Dragon Palace".