Located in Lianzhou City, Qingyuan, Guangdong, it has such an abyss cave with a total length of 1,860 meters, a maximum of 47.8 meters and a maximum width of 53.6 meters. The cave is divided into three layers, running through the bottom of the four hills. The river cave is the oldest underground river in Guangdong. Water caves and dry caves can be seen here. There are few caves in the world where there are two kinds of caves. Qingyuan has such a peerless landscape. It originated from about 200 million years ago, the location of the underground river in Lianzhou was a vast ocean. Later, as the earth's crust moved, the sea floor rose to land. During the second crustal stabilization period, large-scale collapses occurred here, forming today's caves, half of which are land and half of which are rivers. Lianzhou Underground River is a typical giant natural limestone cave in a subtropical karst landform. In the underground river, you can see the ultimate landscape of all karst landforms. You have not yet entered the cave. You can feel the temperature when you stand in the cave. The change of Celsius, the temperature of the cave is maintained at 18 degrees all the year round. It is a good place for summer vacation. The hole is very big, and it is in it. A feeling of "doing a hole in the sky" arises spontaneously. I couldn't help but feel the magical power of nature. Even the people of the state named it "Dakouyan" because of the vastness of the hole. The underground river can be used for 60,000 square meters. This tour of our tour is about 2 hours. It is divided into two major scenic spots, water and road. The land is a karst cave and the waterway is an underground river. Walking and boat trips, this road is the essence of the Lianzhou underground river.