The following information is for learning and reference only, and the ranking is not divided.
| order | name | position | introduce |
| 1 | Benxi Shuidong underground river | China | The underground river of Benxi Water Cave is located in Benxi City, Liaoning Province. There are many strange stalactites here, such as baopingkou, Haichao, Qun monkey and Baoding. They take on various forms. The underground river is 2323 meters long. It is a famous karst landscape area in the north, which attracts many tourists to watch. 570million years ago, Benxi Water Cave was still a vast sea. At this time, the climate was warm, and many creatures multiplied and derived here, After washing and sinking, their bodies deposited biological carbonates and chemical carbonates, which formed the basis of today’s landscape. |
| 2 | San Jose cavern underground river | Spain | San Jose karst cave underground river, with a total length of more than 2751 meters, is the only navigable underground river in Europe. The water temperature of this underground river is generally about 20 degrees Celsius, with constant temperature throughout the year, and so far, but the source and destination of this underground river is still a mystery, and scientists have not found the source of this river. |
| 3 | Longqiao underground river | China | Longqiao underground river is located at the junction of Hubei and Chongqing, with a total length of 50 kilometers. Longqiao underground river enters the ground from Longqiao township at the southern end of Fengjie County, Chongqing. Its entrance belongs to the northern slope of the watershed. Groundwater and surface water cut through the 2000 meter high watershed main vein to the South and flow into Mufu Grand Canyon in Banqiao, forming Yunlong River, a tributary of Qingjiang River. This is a very long underground river. Although the scenery around the underground river is very good, many people are willing to explore, but we must pay attention to safety. |
| 4 | Xuanhe River in China (Yongzhou underground river) | China | Xuanhe River (Yongzhou underground river) in China is located in Qingchun village, Yongzhou Town, Guangxi Province. It is a 20 kilometer tourist area composed of ten underground river caves and ten Xanadu like Minghe nongchang. The scenic area is the hometown of Luoyue ancient country music department established by the ancestors of Zhuang nationality. After textual research, it is the largest underground river that can be developed and visited in Guangxi and the first river for drifting in the underground river in Guangxi. Many people like to explore in the underground river. The more secluded the space is, the easier it is to find beautiful scenery. The scenery in the underground river is like another Peach Blossom Land. |
| 5 | Bifuka underground river | Slovenia | The bifuka underground river is located in the potoina cave in svenia. This cave is the second largest cave in Europe. It is formed by the long-term dissolution of limestone strata by the undercurrent of the bifuka river. There are many salamanders living in the water for hundreds of years. Slovenians call it Merman, and in China it is called giant salamander. |
| 6 | Rio Secreto underground river in Cancun | Mexico | Rio Secreto underground river in Cancun is located in Cancun City, Yucatan Peninsula. Cancun is one of the largest beaches in the world, and this underground river is located here. This underground river was discovered only in 2007, and the north of the underground river is very narrow, so when entering, you should do a good job of safety protection, wear life jackets and helmets. |
| 7 | Pu Hua dark river | Qianjiang District, Chongqing, China | Puhua underground river is located in Qianjiang District, Chongqing, China. It is located in the lower channel of Zhuoshui interchange between Chongqing and Hunan. Passing through Zhuoshui ancient town, it is a relatively short underground river. The underground river is about 2 kilometers long, and the deepest part of the river is more than 20 meters. The cave where the underground river is located has a constant temperature of 22 ℃ all year round. It is a natural air-conditioned room, so there are many tourists here to explore every season. |
| 8 | The Dark River of the Reka River | Italy | Reka river is an underground river, which is located in the skochian karst cave in Slovenia, and here is the most spectacular karst cave in the world. Reka River in the karst cave is one of the most scenic spots to watch. There is a grand canyon with a depth of more than 60 meters. Tourists from all over the world come to visit it all the year round. |
| 9 | The Amazon Hamza River | Brazil | Petrobras drilled hundreds of exploratory wells in the Amazon region in the 1970s and 1980s. Scientists found traces of underground rivers while observing the temperature at the bottom of these exploratory wells. They determined that at the bottom of the sedimentary rock 2000 to 4000 meters underground, there is a huge underground river, namely Hamza River, which is a huge underground river with a drainage area of 4million square kilometers. |
| 10 | Disu underground river | China | Disu underground river is located in Du’an Yao Autonomous County, Guangxi. This underground river has a wide range of connections, with a total area of 1054 square kilometers. It presents a dendritic shape, with a total of 12 tributaries. The groundwater level of the underground river is 30-50 meters deep, some of which are more than 80 meters deep, and the range of water level change is 40-100 meters. The terrain here is steep and uneven, so the water flow speed is relatively fast, which can be used for power generation. |
| 11 | Han Songdong Dark River | Vietnam | Han Song cave is located in Vietnam’s Feng Ya Bang National Park. It is the largest single large-scale natural cave and the largest cave passage in the world. There is an underground river in the cave. The sound of the river flowing is very loud, which makes people feel afraid. It is also poisonous to unknown creatures such as centipedes. The depth from the entrance of Hansong cave to the bottom of the underground river is more than 500 meters. At present, the explorers only dive to a depth of 77 meters. |
| 12 | Payne cave | Shenter County, Central Pennsylvania, United States | Penn cave, located in shenter County, central Pennsylvania, is the only cave in the United States that is all waterways. The underground rivers all over make this cave more mysterious. It takes about an hour to complete the tour, and you also need to take a motorboat. Adjacent to the cave is a 1600 acre Penn forest. Penn cave is a cave in shenter County, central Pennsylvania, and the only cave in the United States that is full of waterways, which makes it more mysterious. |
| 13 | Qingyuan Lianzhou underground river | Lianzhou City, Qingyuan City, Guangdong Province，china | Qingyuan Lianzhou underground river is located in Lianzhou City, Guangdong Province. The total length is 1500 meters. The widest part is 10 meters, the narrowest part is only 1.6 meters, and the water depth is 1-7 meters. The two sides of the river are covered with stone flowers, stone curtains, stone stalactites, quartz, stone pillars, etc. some of them are within reach, with thousands of forms. There are stone scenes such as bird pecking insects, Eight Immortals crossing the sea, Leo lotus, underground Dragon Palace, sea lion greeting guests, flying elephants crossing the river, etc. |
