Lianzhou underground river is hidden in the large mouth karst caves of the mountains, in which a feeling of "unique cave sky" arises. In the mountains and mountains at the junction of Guangdong, Xiang and Gui provinces, it is a subtropical karst landform cave dark river landscape. After geologist analysis, the cave was formed due to the crustal movement 200 million years ago, and now the area can be visited up to 60,000 square meters. The highest place is 47.8 meters, the widest place is 53.6 meters, the temperature in the cave is maintained at about 18℃, the air is fresh, the winter is warm and the summer is cool, it is a holy place to travel and escape the heat.