Introduction to Chuanlongyan: Chuanlongyan is located in the northwest of the county. It is also known as Fengyang Pass because it was the only way for passers-by to enter the city on foot in ancient times. The Qiaoyin River flows through its belly. Chuanlong Rock is formed due to the erosion of groundwater and the uplift of the crust of the Yunnan-Guizhou Plateau. The lower reaches of the Qiaoyin River, which has been running for tens of miles, flows through Songren Village and enters Pingbaotun Black Pool. It emerges from the foot of Neilong Mountain and then breaks into the cave. Note that the county town looks like a giant dragon, disappearing and reappearing, passing through the rock to enter the city, so the ancients named it "Sun Crossing Dragon Rock". The southwest stone wall is about 180 meters high, and there is a small cave at 130 meters, which is called the "phoenix eye" of Fengshan. The setting sun shines at night, and the wall is covered with golden light. It is one of the eight scenic spots in Fengshan, "Danya Night Shine".