The Yangtze and Huai Rivers Flood Central China
Wuhan, Hubei, China
ESTIMATED50% CONFIDENCEThe source[1] bounds the flooding by month rather than by day — "a series of devastating floods that occurred from June to August 1931" — so the pin spans 1 June to the end of August, with the one firm date inside it being the Lake Gaoyou dike breach of 25 August 1931.
Months of flooding along the Yangtze and Huai rivers inundated Wuhan, Nanjing and beyond, culminating in a dike breach at Lake Gaoyou on 25 August. Estimates of the dead run from 150,000 drowned to two million in total.
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