Tags: Cave.

Er Wang Dong (Chinese: 二王洞; literally Second Royal Cave) is a large cave in the Wulong Karst region in Wulong County of Chongqing Municipality of China.Current known length of its passages is 42139 metres (138251 ft) with a maximum depth of 441 m (1447 ft). It is large enough to contain its own weather system.

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