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Er Wang Dong () is a large cave in the Wulong Karst region, in Wulong County of Chongqing Municipality of China. Current known length of its passages is 〔(【引用サイトリンク】title=Er Wang Dong Cave )〕 with a maximum depth of . It is large enough to contain its own weather system. The cave starts in the deep Niubizi tiankeng (牛鼻子天坑; "ox nose sinkhole") and also contains the deep Qingkou tiankeng. Er Wang Dong cave has formed in Lower Ordovician limestone and is located close to another very large cave system - San Wang Dong. Both caves were explored by Hong Meigui Cave Exploration Society. Local people make weather forecasts based on the observations in Niubizi tiankeng - if there is a fog coming from the cave, rain is expected.〔 ==See also== * List of caves in China 抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Er Wang Dong」の詳細全文を読む スポンサード リンク
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