Hankou, alternately romanized as Hankow, was one of the three towns merged to become modern-day Wuhan city, the capital of the Hubei province, China. It stands north of the Han and Yangtze Rivers where the Han flows into the Yangtze. Hankou is connected by bridges to its triplet sister towns Hanyang and Wuchang.

The 1931 China floods, or the 1931 Yangtze–Huai River floods, occurred from June to August 1931 in China, hitting major cities such as Wuhan, Nanjing and beyond, and eventually culminated in a dike breach along Lake Gaoyou on 25 August 1931.