Shuanghedong (: ; : Shuānghédòng; lit. 'twin rivers cave') is the longest in and in , the largest cave system in the world, and the as of May 2023. Its cu. .
The cave contains numerous waterfalls and at least three underground rivers, some of which contain cave and fish weighing several pounds. , frogs, , insects, spiders, crabs, bats,. .
Since exploration began in 1987, at least 20 expeditions from and have explored the cave. In May 2023 the network reached 400 kilometres (250 mi) of development. As of 2024, ther. [pdf]
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